diff --git a/apps/desktop/src/components/grid/DataGrid.vue b/apps/desktop/src/components/grid/DataGrid.vue
index e6b11ed491..9c9a547272 100644
--- a/apps/desktop/src/components/grid/DataGrid.vue
+++ b/apps/desktop/src/components/grid/DataGrid.vue
@@ -175,7 +175,7 @@ import {
 import { adjacentDataGridDetailIndex, type DataGridDetailNavigationDelta } from "@/lib/dataGrid/dataGridDetailNavigation";
 import {
   applyColumnFormatter,
-  buildColumnFormatterKey,
+  columnFormatterKeys,
   defaultIoTDBTimestampFormatter,
   DataGridDateTimePatterns,
   displayTimeZoneOption,
@@ -1521,7 +1521,7 @@ function openCompactLocalFilter(colIdx: number, mode: LocalFilterMode = "local")
   });
 }
 
-function compactColumnActionMenuItems(columnName: string, columnIndex: number) {
+function compactColumnActionMenuItems(columnIndex: number) {
   return createDataGridCompactColumnActionItems({
     labels: {
       formatter: t("grid.columnFormatter"),
@@ -1530,7 +1530,7 @@ function compactColumnActionMenuItems(columnName: string, columnIndex: number) {
       serverFilter: t("grid.databaseValueFilter"),
     },
     icons: { formatter: Code2, clearFormatter: Eraser, filter: Filter, database: Database },
-    formatterAvailable: !!formatterKeyForColumn(columnName),
+    formatterAvailable: !!formatterKeyForColumn(columnIndex),
     formatterActive: columnHasFormatter(columnIndex),
     serverFilterAvailable: canUseServerColumnFilter.value,
   });
@@ -1567,23 +1567,36 @@ function closeLocalFilter() {
   resetServerFilterState();
 }
 
-function formatterKeyForColumn(column: string): string | null {
-  if (!props.connectionId || !props.tableMeta) return null;
-  return buildColumnFormatterKey({
+function formatterKeysForColumn(columnIndex: number): string[] {
+  const resultColumn = props.result.columns[columnIndex];
+  if (!props.connectionId || !resultColumn) return [];
+  return columnFormatterKeys({
     connectionId: props.connectionId,
     database: props.database,
-    schema: props.tableMeta.schema,
-    tableName: props.tableMeta.tableName,
-    column,
+    schema: props.schema,
+    databaseType: resolvedDatabaseType.value,
+    resultColumn,
+    sourceColumn: props.sourceColumns?.[columnIndex],
+    displaySource: props.queryDisplaySourceColumns?.[columnIndex],
+    tableMeta: props.tableMeta,
   });
 }
 
+function formatterKeyForColumn(columnIndex: number): string | null {
+  return formatterKeysForColumn(columnIndex)[0] ?? null;
+}
+
+function savedColumnFormatterEntry(columnIndex: number): { key: string; formatter: ColumnFormatterConfig } | undefined {
+  for (const key of formatterKeysForColumn(columnIndex)) {
+    const formatter = settingsStore.editorSettings.columnFormatters[key];
+    if (formatter) return { key, formatter };
+  }
+  return undefined;
+}
+
 function columnFormatter(columnIndex: number): ColumnFormatterConfig | undefined {
-  const column = props.result.columns[columnIndex];
-  if (!column) return undefined;
-  const key = formatterKeyForColumn(column);
   const columnType = props.result.column_types?.[columnIndex] ?? tableColumnForGridColumn(columnIndex)?.data_type;
-  const savedFormatter = key ? settingsStore.editorSettings.columnFormatters[key] : undefined;
+  const savedFormatter = savedColumnFormatterEntry(columnIndex)?.formatter;
   const configured = resolveColumnFormatter(savedFormatter, settingsStore.editorSettings.customColumnFormatters, {
     pattern: settingsStore.editorSettings.globalDateTimeDisplayFormat,
     columnType,
@@ -1593,10 +1606,7 @@ function columnFormatter(columnIndex: number): ColumnFormatterConfig | undefined
 }
 
 function savedColumnFormatter(columnIndex: number): ColumnFormatterConfig | undefined {
-  const column = props.result.columns[columnIndex];
-  if (!column) return undefined;
-  const key = formatterKeyForColumn(column);
-  return key ? settingsStore.editorSettings.columnFormatters[key] : undefined;
+  return savedColumnFormatterEntry(columnIndex)?.formatter;
 }
 
 function columnHasFormatter(columnIndex: number): boolean {
@@ -1880,8 +1890,7 @@ function handleColumnFormatterOpenChange(value: boolean, columnIndex: number) {
 }
 
 async function saveColumnFormatter(columnIndex: number) {
-  const column = props.result.columns[columnIndex];
-  const key = column ? formatterKeyForColumn(column) : null;
+  const key = formatterKeyForColumn(columnIndex);
   if (!key) return;
   try {
     let formatter = currentFormatterDraft();
@@ -1909,10 +1918,12 @@ async function saveColumnFormatter(columnIndex: number) {
 }
 
 function clearColumnFormatter(columnIndex: number) {
-  const column = props.result.columns[columnIndex];
-  const key = column ? formatterKeyForColumn(column) : null;
-  if (!key) return;
-  settingsStore.updateColumnFormatter(key, undefined);
+  // Clear every candidate key: MySQL-family columns can carry both the shared
+  // empty-schema spelling and the legacy query-side mirrored-schema spelling,
+  // and either surface must leave the column unformatted everywhere.
+  const keys = formatterKeysForColumn(columnIndex);
+  if (!keys.length) return;
+  for (const key of keys) settingsStore.updateColumnFormatter(key, undefined);
   closeColumnFormatter();
 }
 
@@ -13083,6 +13094,8 @@ function openGridSnapshot() {
                     :column-unique-index-label="t('grid.columnUniqueIndex')"
                     :column-regular-index-label="t('grid.columnRegularIndex')"
                     :column-index-kind="showIndexIndicatorsInHeader ? columnIndexMap.get(columnIndexNameKey(col.name)) : undefined"
+                    :formatter-active="columnHasFormatter(col.actualColIdx)"
+                    :formatter-label="t('grid.columnFormatterActive')"
                     @pointerdown="startColumnHeaderDrag(col.visibleColIdx, $event)"
                     @click-capture="onHeaderClickCapture"
                     @click="onHeaderClick(col.visibleColIdx, $event)"
@@ -13130,7 +13143,7 @@ function openGridSnapshot() {
                         </LightDropdownMenu>
                         <LightDropdownMenu
                           v-if="compactColumnHeaderActions"
-                          :items="compactColumnActionMenuItems(col.name, col.actualColIdx)"
+                          :items="compactColumnActionMenuItems(col.actualColIdx)"
                           :open="headerActionMenuOpenColumn === col.actualColIdx"
                           check-position="none"
                           align="end"
@@ -13163,7 +13176,7 @@ function openGridSnapshot() {
                               type="button"
                               class="flex h-4 w-4 shrink-0 items-center justify-center rounded text-muted-foreground hover:bg-gray-200 dark:hover:bg-gray-800 hover:text-foreground"
                               :class="columnHasFormatter(col.actualColIdx) ? 'text-primary opacity-100' : 'opacity-80'"
-                              :disabled="!formatterKeyForColumn(col.name)"
+                              :disabled="!formatterKeyForColumn(col.actualColIdx)"
                               :title="t('grid.columnFormatter')"
                               @click.stop
                             >
diff --git a/apps/desktop/src/components/grid/DataGridColumnHeader.vue b/apps/desktop/src/components/grid/DataGridColumnHeader.vue
index c4566443c4..3d556ff871 100644
--- a/apps/desktop/src/components/grid/DataGridColumnHeader.vue
+++ b/apps/desktop/src/components/grid/DataGridColumnHeader.vue
@@ -37,6 +37,9 @@ const props = defineProps<{
   columnRegularIndexLabel: string;
   /** 该列的索引类型，undefined 时不显示标识 */
   columnIndexKind?: ColumnIndexKind;
+  /** 该列当前展示值应用了格式化规则。 */
+  formatterActive?: boolean;
+  formatterLabel?: string;
 }>();
 
 function columnIndexText(kind: ColumnIndexKind): string {
@@ -75,7 +78,9 @@ const emit = defineEmits<{
       <Hash v-else-if="columnIndexKind && columnIndexKind !== 'none'" class="h-3 w-3 shrink-0" :class="columnIndexColorClass(columnIndexKind)" :title="columnIndexText(columnIndexKind)" />
       <LightTooltip :text="name" side="bottom" :side-offset="4" :disabled="tooltipDisabled">
         <span data-column-tooltip-trigger class="flex min-w-0 flex-1 flex-col overflow-hidden">
-          <span class="min-w-0 truncate leading-4">{{ name }}</span>
+          <span class="flex min-w-0 items-center gap-1 leading-4">
+            <span class="min-w-0 truncate">{{ name }}</span>
+          </span>
           <span v-if="showTypeLine" data-grid-header-type-line class="h-3 min-w-0 truncate text-[10px] font-normal leading-3" :class="[typeClass, { invisible: !columnType }]" :title="columnType || undefined" :aria-hidden="columnType ? undefined : true">{{ columnType }}</span>
           <span v-if="showCommentLine" data-grid-header-comment-line class="h-3 min-w-0 truncate text-[10px] font-normal leading-3 text-muted-foreground" :class="{ invisible: !columnComment }" :title="columnComment || undefined" :aria-hidden="columnComment ? undefined : true">{{
             columnComment
@@ -113,6 +118,7 @@ const emit = defineEmits<{
           </div>
         </template>
       </LightTooltip>
+      <span v-if="formatterActive" data-column-formatter-indicator class="inline-flex h-4 w-4 shrink-0 items-center justify-center rounded-sm bg-violet-600 text-[10px] font-bold leading-none text-white shadow-sm dark:bg-violet-500" :title="formatterLabel" :aria-label="formatterLabel">F</span>
       <span data-column-header-actions class="contents"><slot name="actions" /></span>
     </span>
     <div data-column-resize-handle class="absolute right-0 top-0 bottom-0 w-1.5 cursor-col-resize hover:bg-primary/30" @mousedown.stop="emit('resizeStart', $event)" @click.stop.prevent @dblclick.stop="emit('autoFit')" />
diff --git a/apps/desktop/src/components/grid/__tests__/DataGridColumnFormatterKeys.spec.ts b/apps/desktop/src/components/grid/__tests__/DataGridColumnFormatterKeys.spec.ts
new file mode 100644
index 0000000000..62c60f19b6
--- /dev/null
+++ b/apps/desktop/src/components/grid/__tests__/DataGridColumnFormatterKeys.spec.ts
@@ -0,0 +1,31 @@
+import { readFileSync } from "node:fs";
+import { describe, expect, it } from "vitest";
+
+const dataGridSource = readFileSync(new URL("../DataGrid.vue", import.meta.url), "utf8");
+
+function functionSource(name: string): string {
+  const start = dataGridSource.indexOf(`function ${name}`);
+  expect(start).toBeGreaterThanOrEqual(0);
+  const end = dataGridSource.indexOf("\nfunction ", start + 1);
+  return dataGridSource.slice(start, end < 0 ? undefined : end);
+}
+
+describe("DataGrid column formatter keys", () => {
+  it("derives every key list from the shared canonical key builder", () => {
+    const keysSource = functionSource("formatterKeysForColumn");
+    expect(keysSource).toContain("return columnFormatterKeys({");
+    expect(keysSource).toContain("databaseType: resolvedDatabaseType.value");
+    expect(keysSource).toContain("displaySource: props.queryDisplaySourceColumns?.[columnIndex]");
+    // Saves keep writing the single canonical keys[0] spelling.
+    const saveSource = functionSource("saveColumnFormatter");
+    expect(saveSource).toContain("const key = formatterKeyForColumn(columnIndex);");
+    expect(saveSource).toContain("settingsStore.updateColumnFormatter(key, formatter);");
+  });
+
+  it("clears every candidate key so either surface leaves the column unformatted", () => {
+    const clearSource = functionSource("clearColumnFormatter");
+    expect(clearSource).toContain("const keys = formatterKeysForColumn(columnIndex);");
+    expect(clearSource).toContain("if (!keys.length) return;");
+    expect(clearSource).toContain("for (const key of keys) settingsStore.updateColumnFormatter(key, undefined);");
+  });
+});
diff --git a/apps/desktop/src/components/grid/__tests__/DataGridSurfaces.spec.ts b/apps/desktop/src/components/grid/__tests__/DataGridSurfaces.spec.ts
index 81c789fa92..da70a80db5 100644
--- a/apps/desktop/src/components/grid/__tests__/DataGridSurfaces.spec.ts
+++ b/apps/desktop/src/components/grid/__tests__/DataGridSurfaces.spec.ts
@@ -413,6 +413,28 @@ describe("DataGridPagination", () => {
 });
 
 describe("DataGridColumnHeader", () => {
+  it("uses a compact formatter marker with an accessible explanation", () => {
+    const mounted = mountComponent(DataGridColumnHeader, {
+      name: "created_at",
+      actualColumnIndex: 0,
+      visibleColumnIndex: 0,
+      formatterActive: true,
+      formatterLabel: "Formatted display is active",
+      copyColumnNameLabel: "copy",
+      columnNameLabel: "name",
+      columnTypeLabel: "type",
+      columnCommentLabel: "comment",
+    });
+    const indicator = findOne(mounted.root, (node) => node.props["data-column-formatter-indicator"] === "");
+    const trigger = findOne(mounted.root, (node) => node.props["data-column-tooltip-trigger"] === "");
+
+    expect(hostText(indicator)).toBe("F");
+    expect(String(indicator.props.class)).toContain("h-4 w-4");
+    expect(indicator.props.title).toBe("Formatted display is active");
+    expect(indicator.props["aria-label"]).toBe("Formatted display is active");
+    expect(indicator.parent).not.toBe(trigger);
+  });
+
   it("limits the metadata tooltip trigger to the column text block", () => {
     const mounted = mountComponent(DataGridColumnHeader, {
       name: "status",
diff --git a/apps/desktop/src/i18n/locales/en.ts b/apps/desktop/src/i18n/locales/en.ts
index b7ccb90525..a929ca1369 100644
--- a/apps/desktop/src/i18n/locales/en.ts
+++ b/apps/desktop/src/i18n/locales/en.ts
@@ -1776,6 +1776,7 @@ export default {
     databaseValueFilter: "Database value filter",
     databaseValueFilterFor: "Database Values For '{column}'",
     columnFormatter: "Column formatter",
+    columnFormatterActive: "Formatted display is active",
     columnFormatterFor: "Formatter for '{column}'",
     columnFormatterHint: "Formats display only; raw values stay unchanged.",
     formatterType: "Type",
diff --git a/apps/desktop/src/i18n/locales/es.ts b/apps/desktop/src/i18n/locales/es.ts
index 4b51d45971..0bb761a8f1 100644
--- a/apps/desktop/src/i18n/locales/es.ts
+++ b/apps/desktop/src/i18n/locales/es.ts
@@ -1656,6 +1656,7 @@ export default withEnglishFallback({
     databaseValueFilter: "Filtro de valores de base de datos",
     databaseValueFilterFor: "Valores de base de datos para '{column}'",
     columnFormatter: "Formateador de columna",
+    columnFormatterActive: "La visualización con formato está activa",
     columnFormatterFor: "Formateador para '{column}'",
     columnFormatterHint: "Solo formatea la visualización; los valores sin procesar no cambian.",
     formatterType: "Tipo",
diff --git a/apps/desktop/src/i18n/locales/it.ts b/apps/desktop/src/i18n/locales/it.ts
index b32a6a2a69..94931de73e 100644
--- a/apps/desktop/src/i18n/locales/it.ts
+++ b/apps/desktop/src/i18n/locales/it.ts
@@ -1654,6 +1654,7 @@ export default withEnglishFallback({
     databaseValueFilter: "Filtro valori database",
     databaseValueFilterFor: "Valori database per '{column}'",
     columnFormatter: "Formattatore colonna",
+    columnFormatterActive: "La visualizzazione formattata è attiva",
     columnFormatterFor: "Formattatore per '{column}'",
     columnFormatterHint: "Formatta solo la visualizzazione; i valori effettivi rimangono invariati.",
     formatterType: "Tipo",
diff --git a/apps/desktop/src/i18n/locales/ja.ts b/apps/desktop/src/i18n/locales/ja.ts
index 963652b603..c8f8c4f547 100644
--- a/apps/desktop/src/i18n/locales/ja.ts
+++ b/apps/desktop/src/i18n/locales/ja.ts
@@ -1666,6 +1666,7 @@ export default withEnglishFallback({
     databaseValueFilter: "データベース値フィルター",
     databaseValueFilterFor: "'{column}'のデータベース値",
     columnFormatter: "列フォーマッター",
+    columnFormatterActive: "この列には表示形式が適用されています",
     columnFormatterFor: "'{column}'のフォーマッター",
     columnFormatterHint: "表示のみをフォーマットし、実際の値は変更されません。",
     formatterType: "タイプ",
diff --git a/apps/desktop/src/i18n/locales/ko.ts b/apps/desktop/src/i18n/locales/ko.ts
index a1b52ecdda..561a5c9eea 100644
--- a/apps/desktop/src/i18n/locales/ko.ts
+++ b/apps/desktop/src/i18n/locales/ko.ts
@@ -1649,6 +1649,7 @@ export default withEnglishFallback({
     databaseValueFilter: "데이터베이스 값 필터",
     databaseValueFilterFor: "'{column}' 데이터베이스 값",
     columnFormatter: "컬럼 포매터",
+    columnFormatterActive: "이 열에 서식이 적용되어 있습니다",
     columnFormatterFor: "'{column}' 포매터",
     columnFormatterHint: "표시만 서식 지정하며 원시 값은 변경되지 않습니다.",
     formatterType: "유형",
diff --git a/apps/desktop/src/i18n/locales/pt-BR.ts b/apps/desktop/src/i18n/locales/pt-BR.ts
index a47b52922b..c23afa757e 100644
--- a/apps/desktop/src/i18n/locales/pt-BR.ts
+++ b/apps/desktop/src/i18n/locales/pt-BR.ts
@@ -1656,6 +1656,7 @@ export default withEnglishFallback({
     databaseValueFilter: "Filtro de valores do banco de dados",
     databaseValueFilterFor: "Valores do banco de dados para '{column}'",
     columnFormatter: "Formatador de coluna",
+    columnFormatterActive: "A exibição formatada está ativa",
     columnFormatterFor: "Formatador para '{column}'",
     columnFormatterHint: "Formata apenas a exibição; os valores brutos permanecem inalterados.",
     formatterType: "Tipo",
diff --git a/apps/desktop/src/i18n/locales/zh-CN.ts b/apps/desktop/src/i18n/locales/zh-CN.ts
index 086dfd0c16..207f2b641b 100644
--- a/apps/desktop/src/i18n/locales/zh-CN.ts
+++ b/apps/desktop/src/i18n/locales/zh-CN.ts
@@ -1700,6 +1700,7 @@ export default withEnglishFallback({
     databaseValueFilter: "数据库值筛选",
     databaseValueFilterFor: "数据库值筛选“{column}”",
     columnFormatter: "列格式化",
+    columnFormatterActive: "该列已应用格式化展示",
     columnFormatterFor: "格式化“{column}”",
     columnFormatterHint: "仅改变显示效果，原始值保持不变。",
     formatterType: "类型",
diff --git a/apps/desktop/src/i18n/locales/zh-TW.ts b/apps/desktop/src/i18n/locales/zh-TW.ts
index 11350c2f8b..2a544127ef 100644
--- a/apps/desktop/src/i18n/locales/zh-TW.ts
+++ b/apps/desktop/src/i18n/locales/zh-TW.ts
@@ -1654,6 +1654,7 @@ export default withEnglishFallback({
     databaseValueFilter: "資料庫值篩選",
     databaseValueFilterFor: "資料庫值篩選「{column}」",
     columnFormatter: "欄位格式設定",
+    columnFormatterActive: "此欄位已套用格式化顯示",
     columnFormatterFor: "格式化「{column}」",
     columnFormatterHint: "僅改變顯示效果，原始值保持不變。",
     formatterType: "類型",
diff --git a/apps/desktop/src/lib/__tests__/dataGrid/columnFormatter.spec.ts b/apps/desktop/src/lib/__tests__/dataGrid/columnFormatter.spec.ts
index b1c39bf7b5..d5419b5661 100644
--- a/apps/desktop/src/lib/__tests__/dataGrid/columnFormatter.spec.ts
+++ b/apps/desktop/src/lib/__tests__/dataGrid/columnFormatter.spec.ts
@@ -1,5 +1,86 @@
 import { describe, expect, it } from "vitest";
-import { applyColumnFormatter, defaultIoTDBTimestampFormatter, formatIoTDBTimestampEditorValue, normalizeColumnFormatter, normalizeSupportedDateTimePattern, parseIoTDBTimestampEditorValue } from "@/lib/dataGrid/columnFormatter";
+import { applyColumnFormatter, columnFormatterKeys, defaultIoTDBTimestampFormatter, formatIoTDBTimestampEditorValue, normalizeColumnFormatter, normalizeSupportedDateTimePattern, parseIoTDBTimestampEditorValue } from "@/lib/dataGrid/columnFormatter";
+
+describe("columnFormatterKeys", () => {
+  // MySQL query metadata mirrors the database into the schema slot, while the
+  // table view has always keyed formatters with an empty schema.
+  const mysqlQueryColumn = {
+    connectionId: "conn1",
+    database: "app",
+    databaseType: "mysql",
+    resultColumn: "created_at",
+    displaySource: { database: "app", schema: "app", tableName: "users", sourceColumn: "created_at" },
+  };
+  const mysqlTableColumn = {
+    connectionId: "conn1",
+    database: "app",
+    databaseType: "mysql",
+    resultColumn: "created_at",
+    tableMeta: { database: "app", tableName: "users" },
+  };
+
+  it("writes MySQL query-result saves under the table-view empty-schema key", () => {
+    const keys = columnFormatterKeys(mysqlQueryColumn);
+    expect(keys[0]).toBe("conn1::app::::users::created_at");
+    // The mirrored spelling stays readable so older saves keep applying.
+    expect(keys).toContain("conn1::app::app::users::created_at");
+  });
+
+  it("resolves a MySQL formatter saved from a query result in the table view", () => {
+    const queryKeys = columnFormatterKeys(mysqlQueryColumn);
+    const tableKeys = columnFormatterKeys(mysqlTableColumn);
+    // A save writes keys[0]; the table-view read list must include that key.
+    expect(tableKeys).toContain(queryKeys[0]!);
+    expect(tableKeys[0]).toBe(queryKeys[0]);
+    // Clearing from the table view removes the legacy mirrored save too.
+    expect(tableKeys).toContain("conn1::app::app::users::created_at");
+  });
+
+  it("keeps the physical schema as the write key for schema-aware dialects", () => {
+    const keys = columnFormatterKeys({
+      connectionId: "conn1",
+      database: "app",
+      databaseType: "postgres",
+      resultColumn: "created_at",
+      displaySource: { database: "app", schema: "public", tableName: "users", sourceColumn: "created_at" },
+    });
+    expect(keys).toEqual(["conn1::app::public::users::created_at"]);
+  });
+
+  it("returns no keys without a physical table identity", () => {
+    expect(columnFormatterKeys({ connectionId: "conn1", database: "app", databaseType: "mysql", resultColumn: "total" })).toEqual([]);
+    expect(
+      columnFormatterKeys({
+        connectionId: "conn1",
+        database: "app",
+        databaseType: "mysql",
+        resultColumn: "total",
+        // Cached legacy mapping without a resolvable physical table.
+        displaySource: { sourceColumn: "total" },
+      }),
+    ).toEqual([]);
+  });
+
+  it("keys writes by the physical source column, not an alias", () => {
+    const keys = columnFormatterKeys({ ...mysqlQueryColumn, resultColumn: "createdAt" });
+    expect(keys[0]).toBe("conn1::app::::users::created_at");
+    expect(keys.every((key) => key.endsWith("::created_at"))).toBe(true);
+  });
+
+  it("canonicalizes writes for unresolved query columns backed by mirrored tab metadata", () => {
+    // A query column without a per-ordinal source mapping still inherits the
+    // tab's tableMeta, whose MySQL schema slot mirrors the database.
+    const keys = columnFormatterKeys({
+      connectionId: "conn1",
+      database: "app",
+      databaseType: "mysql",
+      resultColumn: "created_at",
+      tableMeta: { database: "app", schema: "app", tableName: "users" },
+    });
+    expect(keys[0]).toBe("conn1::app::::users::created_at");
+    expect(keys).toContain("conn1::app::app::users::created_at");
+  });
+});
 
 describe("normalizeColumnFormatter", () => {
   it("preserves a structured manual reference filter", () => {
diff --git a/apps/desktop/src/lib/dataGrid/columnFormatter.ts b/apps/desktop/src/lib/dataGrid/columnFormatter.ts
index b53630f021..a2c787f732 100644
--- a/apps/desktop/src/lib/dataGrid/columnFormatter.ts
+++ b/apps/desktop/src/lib/dataGrid/columnFormatter.ts
@@ -148,6 +148,89 @@ export function buildColumnFormatterKey(parts: ColumnFormatterKeyParts): string
   return [parts.connectionId, parts.database ?? "", parts.schema ?? "", parts.tableName, parts.column].join("::");
 }
 
+export interface ColumnFormatterKeyContext {
+  connectionId: string;
+  database?: string;
+  schema?: string;
+  databaseType?: string;
+  /** Result-column label (may be an alias). */
+  resultColumn: string;
+  /** Physical source column label when the grid already knows it. */
+  sourceColumn?: string;
+  /** Resolved physical source identity of a query result column, when known. */
+  displaySource?: {
+    database?: string;
+    schema?: string;
+    tableName?: string;
+    sourceColumn?: string;
+  };
+  tableMeta?: {
+    database?: string;
+    schema?: string;
+    tableName: string;
+  };
+}
+
+// Ordered formatter-key candidates for one grid column. keys[0] is the write
+// key: always the physical source identity, never the current tab namespace,
+// so a same-named table in another database or schema must not inherit this
+// column's formatter. Remaining keys are read/clear fallbacks for configs
+// saved by other surfaces or older versions.
+//
+// MySQL-family query metadata mirrors the database into the schema slot while
+// table-view keys have always used an empty schema. Keep the shared
+// empty-schema key first so a formatter saved from a query result is written
+// to (and read by) the table view too, and retain the mirrored spelling only
+// as a read fallback for configs saved by older versions.
+export function columnFormatterKeys(context: ColumnFormatterKeyContext): string[] {
+  const { connectionId, database, schema, databaseType, resultColumn } = context;
+  const displaySource = context.displaySource;
+  // A joined-result source key is only meaningful within one query. Do not
+  // guess a formatter key for cached legacy mappings that lack a physical table.
+  if (displaySource && !displaySource.tableName) return [];
+
+  const tableMeta = displaySource?.tableName
+    ? {
+        database: displaySource.database,
+        schema: displaySource.schema,
+        tableName: displaySource.tableName,
+      }
+    : context.tableMeta;
+  if (!tableMeta?.tableName) return [];
+
+  const sourceColumn = displaySource?.sourceColumn || context.sourceColumn || resultColumn;
+  const keys = new Set<string>();
+  const primaryDatabase = tableMeta.database?.trim() || database;
+  const primarySchema = tableMeta.schema ?? schema;
+  const isMysql = databaseType === "mysql";
+  const mirroredSchema = isMysql ? primaryDatabase : undefined;
+  const addKey = (keyDatabase: string | undefined, keySchema: string | undefined, column: string) => {
+    keys.add(
+      buildColumnFormatterKey({
+        connectionId,
+        database: keyDatabase,
+        schema: keySchema,
+        tableName: tableMeta.tableName,
+        column,
+      }),
+    );
+  };
+
+  if (isMysql) addKey(primaryDatabase, "", sourceColumn);
+  addKey(primaryDatabase, primarySchema, sourceColumn);
+  if (displaySource?.tableName) return [...keys];
+
+  const databases = [...new Set([primaryDatabase, database, context.tableMeta?.database])];
+  const schemas = [...new Set([primarySchema, schema, context.tableMeta?.schema, "", mirroredSchema])];
+  const columns = [...new Set([sourceColumn, resultColumn])];
+  for (const keyDatabase of databases) {
+    for (const keySchema of schemas) {
+      for (const column of columns) addKey(keyDatabase, keySchema, column);
+    }
+  }
+  return [...keys];
+}
+
 export function normalizeColumnFormatter(value: unknown): ColumnFormatterConfig | undefined {
   if (!value || typeof value !== "object") return undefined;
   const config = value as Record<string, any>;
diff --git a/apps/desktop/src/stores/__tests__/queryStore.groupByColumnComments.spec.ts b/apps/desktop/src/stores/__tests__/queryStore.groupByColumnComments.spec.ts
index cd69e4f82d..54ea63d3ed 100644
--- a/apps/desktop/src/stores/__tests__/queryStore.groupByColumnComments.spec.ts
+++ b/apps/desktop/src/stores/__tests__/queryStore.groupByColumnComments.spec.ts
@@ -115,7 +115,7 @@ describe("queryStore grouped-result column comments", () => {
     // Only the directly projected physical column carries its comment; the
     // aggregate expression resolves to nothing and must not guess.
     expect(tab.resultColumnComments).toEqual(["所属部门", undefined]);
-    expect(tab.queryDisplaySourceColumns).toEqual([{ sourceKey: "users:0", sourceColumn: "department" }, undefined]);
+    expect(tab.queryDisplaySourceColumns).toEqual([{ sourceKey: "users:0", sourceColumn: "department", database: "app", schema: "app", tableName: "users" }, undefined]);
   });
 
   it("resolves aliased grouped columns back to their physical column (T2)", async () => {
@@ -139,7 +139,7 @@ describe("queryStore grouped-result column comments", () => {
     await vi.waitFor(() => expect(tab.resultColumnComments).toBeDefined());
     expect(tab.queryEditabilityReason).toBe("aggregation");
     expect(tab.resultColumnComments).toEqual(["所属部门", undefined]);
-    expect(tab.queryDisplaySourceColumns).toEqual([{ sourceKey: "users:0", sourceColumn: "department" }, undefined]);
+    expect(tab.queryDisplaySourceColumns).toEqual([{ sourceKey: "users:0", sourceColumn: "department", database: "app", schema: "app", tableName: "users" }, undefined]);
   });
 
   it("keeps comments for HAVING queries (T3)", async () => {
@@ -186,7 +186,7 @@ describe("queryStore grouped-result column comments", () => {
     await vi.waitFor(() => expect(tab.resultColumnComments).toBeDefined());
     expect(tab.queryEditabilityReason).toBe("aggregation");
     expect(tab.resultColumnComments).toEqual(["所属部门", undefined]);
-    expect(tab.queryDisplaySourceColumns).toEqual([{ sourceKey: "u:0", sourceColumn: "department" }, undefined]);
+    expect(tab.queryDisplaySourceColumns).toEqual([{ sourceKey: "u:0", sourceColumn: "department", database: "app", schema: "app", tableName: "users" }, undefined]);
   });
 
   it("maps multiple grouped physical columns (T5)", async () => {
@@ -236,7 +236,7 @@ describe("queryStore grouped-result column comments", () => {
     expect(tab.queryDisplaySourceColumns).toEqual([undefined, undefined]);
   });
 
-  it("keeps ordinary editable queries free of the new display fields (T10)", async () => {
+  it("stores physical source identities for ordinary editable queries (T10)", async () => {
     analyzeEditableQueryEditability.mockResolvedValue({
       editable: true,
       analysis: {
@@ -268,7 +268,10 @@ describe("queryStore grouped-result column comments", () => {
     const tab = store.tabs.find((item) => item.id === tabId)!;
     await vi.waitFor(() => expect(tab.tableMeta?.tableName).toBe("users"));
     expect(tab.resultColumnComments).toBeUndefined();
-    expect(tab.queryDisplaySourceColumns).toBeUndefined();
+    expect(tab.queryDisplaySourceColumns).toEqual([
+      { sourceKey: "users:0", sourceColumn: "id", database: "app", schema: "app", tableName: "users" },
+      { sourceKey: "users:0", sourceColumn: "department", database: "app", schema: "app", tableName: "users" },
+    ]);
     expect(tab.querySourceColumns).toEqual(["id", "department"]);
   });
 
diff --git a/apps/desktop/src/stores/__tests__/queryStore.multiSourceColumnComments.spec.ts b/apps/desktop/src/stores/__tests__/queryStore.multiSourceColumnComments.spec.ts
index ad5d3fe11c..2f238532dd 100644
--- a/apps/desktop/src/stores/__tests__/queryStore.multiSourceColumnComments.spec.ts
+++ b/apps/desktop/src/stores/__tests__/queryStore.multiSourceColumnComments.spec.ts
@@ -137,12 +137,13 @@ describe("queryStore multi-source result column comments", () => {
     // keeps its own comment instead of first-source-wins on the name.
     expect(tab.resultColumnComments).toEqual(["订单ID", "下单用户", "用户ID", "用户名"]);
 
-    // The display mapping carries source identity per ordinal.
+    // The display mapping carries both source identity and physical table
+    // identity per ordinal, so display-only features can share table settings.
     expect(tab.queryDisplaySourceColumns).toEqual([
-      { sourceKey: "a", sourceColumn: "id" },
-      { sourceKey: "a", sourceColumn: "user_id" },
-      { sourceKey: "b", sourceColumn: "id" },
-      { sourceKey: "b", sourceColumn: "name" },
+      { sourceKey: "a", sourceColumn: "id", database: "app", schema: "app", tableName: "orders" },
+      { sourceKey: "a", sourceColumn: "user_id", database: "app", schema: "app", tableName: "orders" },
+      { sourceKey: "b", sourceColumn: "id", database: "app", schema: "app", tableName: "users" },
+      { sourceKey: "b", sourceColumn: "name", database: "app", schema: "app", tableName: "users" },
     ]);
   });
 
@@ -187,8 +188,8 @@ describe("queryStore multi-source result column comments", () => {
     await vi.waitFor(() => expect(tab.resultColumnComments).toBeDefined());
     expect(tab.resultColumnComments).toEqual(["订单ID", "用户名"]);
     expect(tab.queryDisplaySourceColumns).toEqual([
-      { sourceKey: "a", sourceColumn: "id" },
-      { sourceKey: "b", sourceColumn: "name" },
+      { sourceKey: "a", sourceColumn: "id", database: "app", schema: "app", tableName: "orders" },
+      { sourceKey: "b", sourceColumn: "name", database: "app", schema: "app", tableName: "users" },
     ]);
   });
 
@@ -279,9 +280,9 @@ describe("queryStore multi-source result column comments", () => {
     // of the previous map would have collapsed them.
     expect(tab.resultColumnComments).toEqual(["订单ID", "大写ID", "大写Name"]);
     expect(tab.queryDisplaySourceColumns).toEqual([
-      { sourceKey: "a", sourceColumn: "id" },
-      { sourceKey: "a", sourceColumn: "ID" },
-      { sourceKey: "b", sourceColumn: "Name" },
+      { sourceKey: "a", sourceColumn: "id", database: "app", schema: undefined, tableName: "orders" },
+      { sourceKey: "a", sourceColumn: "ID", database: "app", schema: undefined, tableName: "orders" },
+      { sourceKey: "b", sourceColumn: "Name", database: "app", schema: undefined, tableName: "users" },
     ]);
   });
 
@@ -326,12 +327,12 @@ describe("queryStore multi-source result column comments", () => {
     await vi.waitFor(() => expect(tab.resultColumnComments).toBeDefined());
     expect(tab.resultColumnComments).toEqual(["订单ID", "用户ID"]);
     expect(tab.queryDisplaySourceColumns).toEqual([
-      { sourceKey: "a", sourceColumn: "id" },
-      { sourceKey: "b", sourceColumn: "id" },
+      { sourceKey: "a", sourceColumn: "id", database: "app", schema: "app", tableName: "orders" },
+      { sourceKey: "b", sourceColumn: "id", database: "app", schema: "app", tableName: "users" },
     ]);
   });
 
-  it("keeps single-source results free of multi-source comment fields", async () => {
+  it("stores physical source identities for single-source result columns", async () => {
     analyzeEditableQueryEditability.mockResolvedValue({
       editable: true,
       analysis: {
@@ -363,7 +364,10 @@ describe("queryStore multi-source result column comments", () => {
     const tab = store.tabs.find((item) => item.id === tabId)!;
     await vi.waitFor(() => expect(tab.tableMeta?.tableName).toBe("orders"));
     expect(tab.resultColumnComments).toBeUndefined();
-    expect(tab.queryDisplaySourceColumns).toBeUndefined();
+    expect(tab.queryDisplaySourceColumns).toEqual([
+      { sourceKey: "orders:0", sourceColumn: "id", database: "app", schema: "app", tableName: "orders" },
+      { sourceKey: "orders:0", sourceColumn: "amount", database: "app", schema: "app", tableName: "orders" },
+    ]);
     expect(tab.querySourceColumns).toEqual(["id", "amount"]);
   });
 
diff --git a/apps/desktop/src/stores/__tests__/queryStore.mysqlGroupedEditing.spec.ts b/apps/desktop/src/stores/__tests__/queryStore.mysqlGroupedEditing.spec.ts
index d8b205d015..6fbffacaee 100644
--- a/apps/desktop/src/stores/__tests__/queryStore.mysqlGroupedEditing.spec.ts
+++ b/apps/desktop/src/stores/__tests__/queryStore.mysqlGroupedEditing.spec.ts
@@ -102,7 +102,7 @@ describe("queryStore MySQL grouped-result editing", () => {
     expect(tab.querySourceColumns).toEqual(["id", "department", undefined]);
     expect(tab.tableMeta).toMatchObject({ tableName: "users", primaryKeys: ["id"] });
     expect(tab.resultColumnComments).toEqual(["user id", "department", undefined]);
-    expect(tab.queryDisplaySourceColumns).toEqual([{ sourceKey: "u:0", sourceColumn: "id" }, { sourceKey: "u:0", sourceColumn: "department" }, undefined]);
+    expect(tab.queryDisplaySourceColumns).toEqual([{ sourceKey: "u:0", sourceColumn: "id", database: "app", schema: "app", tableName: "users" }, { sourceKey: "u:0", sourceColumn: "department", database: "app", schema: "app", tableName: "users" }, undefined]);
     expect(listIndexes).not.toHaveBeenCalled();
   });
 
@@ -124,7 +124,12 @@ describe("queryStore MySQL grouped-result editing", () => {
 
     expect(tab.queryEditabilityReason).toBeUndefined();
     expect(tab.querySourceColumns).toEqual(["id", "department", undefined, undefined]);
-    expect(tab.queryDisplaySourceColumns).toEqual([{ sourceKey: "u:0", sourceColumn: "id" }, { sourceKey: "u:0", sourceColumn: "department" }, { sourceKey: "o:1", sourceColumn: "user_id" }, undefined]);
+    expect(tab.queryDisplaySourceColumns).toEqual([
+      { sourceKey: "u:0", sourceColumn: "id", database: "app", schema: "app", tableName: "users" },
+      { sourceKey: "u:0", sourceColumn: "department", database: "app", schema: "app", tableName: "users" },
+      { sourceKey: "o:1", sourceColumn: "user_id", database: "app", schema: "app", tableName: "orders" },
+      undefined,
+    ]);
   });
 
   it("keeps a non-root source read-only even when its complete primary key is grouped", async () => {
@@ -199,7 +204,14 @@ describe("queryStore MySQL grouped-result editing", () => {
 
     expect(tab.queryEditabilityReason).toBeUndefined();
     expect(tab.querySourceColumns).toEqual(["id", "department", undefined, undefined, undefined, undefined]);
-    expect(tab.queryDisplaySourceColumns).toEqual([{ sourceKey: "u:0", sourceColumn: "id" }, { sourceKey: "u:0", sourceColumn: "department" }, { sourceKey: "u:0", sourceColumn: "display_label" }, { sourceKey: "u:0", sourceColumn: "stored_label" }, undefined, undefined]);
+    expect(tab.queryDisplaySourceColumns).toEqual([
+      { sourceKey: "u:0", sourceColumn: "id", database: "app", schema: "app", tableName: "users" },
+      { sourceKey: "u:0", sourceColumn: "department", database: "app", schema: "app", tableName: "users" },
+      { sourceKey: "u:0", sourceColumn: "display_label", database: "app", schema: "app", tableName: "users" },
+      { sourceKey: "u:0", sourceColumn: "stored_label", database: "app", schema: "app", tableName: "users" },
+      undefined,
+      undefined,
+    ]);
   });
 
   it("accepts a complete composite primary key only when it is the exact grouping key", async () => {
diff --git a/apps/desktop/src/stores/queryStore.ts b/apps/desktop/src/stores/queryStore.ts
index c559cad117..f0da38081a 100644
--- a/apps/desktop/src/stores/queryStore.ts
+++ b/apps/desktop/src/stores/queryStore.ts
@@ -3844,7 +3844,12 @@ export const useQueryStore = defineStore("query", () => {
       const loaded = loadedSources.find((entry) => entry.source.key === ref.sourceKey);
       const comment = loaded?.tableMeta.columns.find((column) => column.name === ref.sourceColumn)?.comment?.trim();
       comments.push(comment || undefined);
-      mapping.push(ref);
+      mapping.push({
+        ...ref,
+        database: loaded?.tableMeta.database,
+        schema: loaded?.tableMeta.schema,
+        tableName: loaded?.tableMeta.tableName,
+      });
     }
     return { comments, mapping };
   }
@@ -4335,7 +4340,7 @@ export const useQueryStore = defineStore("query", () => {
         const metadataAnalysis = expandStarProjectionColumnsForSource(bindColumnsForSource(dbType, loaded.analysis, loaded.source, loaded.tableMeta.columns, allSourceColumns), loaded.source, loaded.tableMeta.columns);
         const syntheticRowIdProjection = hiddenPrimaryKeys.find((projection) => projection.sourceName.toUpperCase() === DBX_ROWID_COLUMN);
         const primaryKeys = loaded.tableMeta.primaryKeys.length === 0 && syntheticRowIdProjection ? [DBX_ROWID_COLUMN] : loaded.tableMeta.primaryKeys;
-        const keylessResultInfo = primaryKeys.length === 0 ? resolveResultColumnInfo(dbType, analysis, tab.result.columns, loadedSources) : undefined;
+        const displaySourceInfo = resolveResultColumnInfo(dbType, analysis, tab.result.columns, loadedSources);
         const sourceColumns = sourceColumnsForResult(metadataAnalysis, tab.result.columns, loaded.source.key);
         if (sourceColumns && syntheticRowIdProjection) {
           const resultIndex = tab.result.columns.findIndex((column) => column.toLowerCase() === syntheticRowIdProjection.alias.toLowerCase());
@@ -4347,7 +4352,8 @@ export const useQueryStore = defineStore("query", () => {
             querySourceColumns: undefined,
             queryEditabilityReason: "no-primary-key",
             tableMeta: loaded.tableMeta,
-            resultColumnComments: keylessResultInfo?.comments,
+            resultColumnComments: displaySourceInfo.comments,
+            queryDisplaySourceColumns: displaySourceInfo.mapping,
           };
         }
 
@@ -4358,6 +4364,7 @@ export const useQueryStore = defineStore("query", () => {
             querySourceColumns: undefined,
             queryEditabilityReason: "primary-key-not-returned",
             tableMeta: loaded.tableMeta,
+            queryDisplaySourceColumns: displaySourceInfo.mapping,
           };
         }
 
@@ -4367,6 +4374,7 @@ export const useQueryStore = defineStore("query", () => {
             querySourceColumns: undefined,
             queryEditabilityReason: "aliased-columns",
             tableMeta: loaded.tableMeta,
+            queryDisplaySourceColumns: displaySourceInfo.mapping,
           };
         }
 
@@ -4375,7 +4383,8 @@ export const useQueryStore = defineStore("query", () => {
           querySourceColumns: sourceColumns,
           queryEditabilityReason: undefined,
           tableMeta: primaryKeys === loaded.tableMeta.primaryKeys ? loaded.tableMeta : { ...loaded.tableMeta, primaryKeys },
-          resultColumnComments: keylessResultInfo?.comments,
+          resultColumnComments: primaryKeys.length === 0 ? displaySourceInfo.comments : undefined,
+          queryDisplaySourceColumns: displaySourceInfo.mapping,
         };
       }
 
diff --git a/apps/desktop/src/types/database.ts b/apps/desktop/src/types/database.ts
index b6ba078266..c26280ebc1 100644
--- a/apps/desktop/src/types/database.ts
+++ b/apps/desktop/src/types/database.ts
@@ -775,6 +775,10 @@ export interface SpatialColumn {
 export interface QueryResultSourceColumnRef {
   sourceKey: string;
   sourceColumn: string;
+  /** Physical source identity for display-only features such as column formatters. */
+  database?: string;
+  schema?: string;
+  tableName?: string;
 }
 
 export interface QueryResultRun {