diff --git a/apps/desktop/src/components/structure/TableStructureEditor.vue b/apps/desktop/src/components/structure/TableStructureEditor.vue
index 54d42d5b6e..a3c914920a 100644
--- a/apps/desktop/src/components/structure/TableStructureEditor.vue
+++ b/apps/desktop/src/components/structure/TableStructureEditor.vue
@@ -12,6 +12,7 @@ import {
   ChevronDown,
   ChevronUp,
   Database,
+  Info,
   KeyRound,
   Loader2,
   Maximize2,
@@ -28,6 +29,7 @@ import {
   DropdownMenuTrigger,
 } from "@/components/ui/dropdown-menu";
 import { Popover, PopoverContent, PopoverTrigger } from "@/components/ui/popover";
+import { Tooltip, TooltipContent, TooltipTrigger } from "@/components/ui/tooltip";
 import { SearchableSelect } from "@/components/ui/searchable-select";
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
 import { useConnectionStore } from "@/stores/connectionStore";
@@ -134,6 +136,7 @@ function onIndexColResize(e: MouseEvent, col: number) {
 const connection = computed(() => (props.connectionId ? store.getConfig(props.connectionId) : undefined));
 const databaseType = computed(() => connection.value?.db_type);
 const structureCapabilities = computed(() => getTableStructureCapabilities(databaseType.value));
+const isTableCommentDisabled = computed(() => !structureCapabilities.value.comment);
 const dataTypeOptions = computed(() => DATA_TYPE_OPTIONS[databaseType.value ?? ""] ?? []);
 
 const indexTypesByDb: Record<string, string[]> = {
@@ -509,7 +512,14 @@ watch(
         v-model="tableComment"
         :placeholder="t('structureEditor.tableCommentPlaceholder')"
         class="h-6 max-w-[320px] text-[11px]"
+        :disabled="isTableCommentDisabled"
       />
+      <Tooltip v-if="isTableCommentDisabled">
+        <TooltipTrigger as-child>
+          <Info class="h-4 w-4 shrink-0 text-muted-foreground" />
+        </TooltipTrigger>
+        <TooltipContent>{{ t("structureEditor.tableCommentUnsupported") }}</TooltipContent>
+      </Tooltip>
     </div>
 
     <div v-if="loading" class="flex min-h-0 flex-1 items-center justify-center gap-2 text-sm text-muted-foreground">
diff --git a/apps/desktop/src/i18n/locales/en.ts b/apps/desktop/src/i18n/locales/en.ts
index 235150e9ca..7afdab5d63 100644
--- a/apps/desktop/src/i18n/locales/en.ts
+++ b/apps/desktop/src/i18n/locales/en.ts
@@ -989,6 +989,7 @@ export default {
     editComment: "Edit comment",
     commentPlaceholder: "Enter column comment...",
     tableCommentPlaceholder: "Enter table comment...",
+    tableCommentUnsupported: "Table comments are not supported by this database",
     actions: "Actions",
     indexName: "Index",
     indexColumns: "Columns",
diff --git a/apps/desktop/src/i18n/locales/es.ts b/apps/desktop/src/i18n/locales/es.ts
index fe41a9cb2b..6441037649 100644
--- a/apps/desktop/src/i18n/locales/es.ts
+++ b/apps/desktop/src/i18n/locales/es.ts
@@ -883,6 +883,7 @@ export default {
     editComment: "Editar comentario",
     commentPlaceholder: "Ingresar comentario de columna...",
     tableCommentPlaceholder: "Ingresar comentario de tabla...",
+    tableCommentUnsupported: "La base de datos no admite comentarios de tabla",
     actions: "Acciones",
     indexName: "Índice",
     indexColumns: "Columnas",
diff --git a/apps/desktop/src/i18n/locales/zh-CN.ts b/apps/desktop/src/i18n/locales/zh-CN.ts
index 6b89897d6f..5a7764f3fe 100644
--- a/apps/desktop/src/i18n/locales/zh-CN.ts
+++ b/apps/desktop/src/i18n/locales/zh-CN.ts
@@ -967,6 +967,7 @@ export default {
     editComment: "编辑注释",
     commentPlaceholder: "输入字段注释...",
     tableCommentPlaceholder: "输入表注释...",
+    tableCommentUnsupported: "当前数据库不支持表注释",
     actions: "操作",
     indexName: "索引名",
     indexColumns: "字段列表",
diff --git a/packages/app-tests/tableStructureCapabilities.test.ts b/packages/app-tests/tableStructureCapabilities.test.ts
index 560c2caf14..b8483b5214 100644
--- a/packages/app-tests/tableStructureCapabilities.test.ts
+++ b/packages/app-tests/tableStructureCapabilities.test.ts
@@ -5,6 +5,14 @@ import {
   getTableStructureCapabilities,
 } from "../../apps/desktop/src/lib/tableStructureCapabilities.ts";
 
+test("sqlite and duckdb do not support table comments", () => {
+  for (const dbType of ["sqlite", "duckdb"] as const) {
+    const caps = getTableStructureCapabilities(dbType);
+    assert.equal(caps.comment, false, `${dbType} should not support comments`);
+    assert.equal(caps.createTable, true, `${dbType} should still support creating tables`);
+  }
+});
+
 test("postgres-like databases expose safe structure editing capabilities", () => {
   for (const dbType of ["postgres", "gaussdb", "opengauss", "highgo", "vastbase", "kingbase"] as const) {
     const caps = getTableStructureCapabilities(dbType);
diff --git a/packages/app-tests/tableStructureEditorPresentation.test.ts b/packages/app-tests/tableStructureEditorPresentation.test.ts
index 55947217bf..2955fb42e4 100644
--- a/packages/app-tests/tableStructureEditorPresentation.test.ts
+++ b/packages/app-tests/tableStructureEditorPresentation.test.ts
@@ -80,3 +80,11 @@ test("new column input is focused after adding a field", () => {
   assert.match(source, /data-column-name-input/);
   assert.match(source, /input\?\.focus\(\)/);
 });
+
+test("table comment input is disabled and shows tooltip when database does not support comments", () => {
+  assert.match(source, /isTableCommentDisabled/);
+  assert.match(source, /:disabled="isTableCommentDisabled"/);
+  assert.match(source, /v-if="isTableCommentDisabled"/);
+  assert.match(source, /Tooltip/);
+  assert.match(source, /tableCommentUnsupported/);
+});