fix(oracle): emit DEFAULT before NOT NULL in create-table columns

crates/dbx-sql/src/table_structure_sql/create_table.rs

@@ -110,6 +110,19 @@ pub fn build_create_table_sql(mut options: TableStructureSqlOptions) -> TableStr
                 parts.push(format!("COLLATE {}", quote_ident(dialect, &column.collation)));
             }
         }
+        // Oracle's column grammar is `col type [DEFAULT expr] [inline constraint ...]`, so the
+        // DEFAULT clause has to precede NOT NULL. Emitting `NOT NULL DEFAULT ...` leaves the
+        // parser looking for the closing parenthesis of the column list and fails with
+        // ORA-00907 (t8y2/dbx#9477). Scoped to Oracle: every other engine keeps the historical
+        // NOT NULL-then-DEFAULT order.
+        let default_value = normalize_default(Some(&column.default_value));
+        let default_clause = (!default_value.is_empty() && dialect != StructureDialect::ManticoreSearch)
+            .then(|| format!("DEFAULT {}", format_default_for_sql(dialect, &column.data_type, &default_value)));
+        if dialect == StructureDialect::Oracle {
+            if let Some(clause) = default_clause.clone() {
+                parts.push(clause);
+            }
+        }
         if dialect == StructureDialect::Sqlite
             && column.is_primary_key
             && column.extra.as_ref().is_some_and(|e| e.auto_increment.unwrap_or(false))
@@ -130,9 +143,10 @@ pub fn build_create_table_sql(mut options: TableStructureSqlOptions) -> TableStr
         if let Some(extra_clause) = column_extra_clause(dialect, column) {
             parts.push(extra_clause);
         }
-        let default_value = normalize_default(Some(&column.default_value));
-        if !default_value.is_empty() && dialect != StructureDialect::ManticoreSearch {
-            parts.push(format!("DEFAULT {}", format_default_for_sql(dialect, &column.data_type, &default_value)));
+        if dialect != StructureDialect::Oracle {
+            if let Some(clause) = default_clause {
+                parts.push(clause);
+            }
         }
         if let Some(on_update) = column.extra.as_ref().and_then(|e| e.on_update_current_timestamp).filter(|v| *v) {
             if on_update && dialect == StructureDialect::Mysql {

crates/dbx-sql/src/table_structure_sql/tests.rs

@@ -1207,6 +1207,50 @@ fn oracle_timestamp_default_precedes_nullability_in_modify_sql() {
     );
 }
 
+#[test]
+fn oracle_create_table_places_default_before_not_null() {
+    // Oracle's column grammar is `col type [DEFAULT expr] [NOT NULL]`. Cloning a table whose
+    // NOT NULL column carries a default used to emit `NOT NULL DEFAULT ...`, which the server
+    // rejects with ORA-00907 (t8y2/dbx#9477).
+    let mut id = column("ID");
+    id.data_type = "NUMBER(10)".to_string();
+    id.is_primary_key = true;
+    let mut status = column("STATUS");
+    status.data_type = "VARCHAR2(1 BYTE)".to_string();
+    status.is_nullable = false;
+    status.default_value = "'A'".to_string();
+    let mut created_at = column("CREATED_AT");
+    created_at.data_type = "DATE".to_string();
+    created_at.is_nullable = false;
+    created_at.default_value = "SYSDATE".to_string();
+
+    let result = build_create_table_sql(TableStructureSqlOptions {
+        database_type: Some(DatabaseType::Oracle),
+        driver_profile: None,
+        schema: Some("APP".to_string()),
+        table_name: "ORDERS_COPY".to_string(),
+        columns: vec![id, status, created_at],
+        indexes: Vec::new(),
+        foreign_keys: Vec::new(),
+        triggers: Vec::new(),
+        table_comment: None,
+        original_table_comment: None,
+        mysql_engine: None,
+        partitioned: false,
+        is_gaussdb_m_mode: false,
+        table_collation: None,
+    });
+
+    assert_eq!(result.warnings, Vec::<String>::new());
+    assert!(
+        result.statements[0].contains("\"STATUS\" VARCHAR2(1 BYTE) DEFAULT 'A' NOT NULL"),
+        "ddl: {}",
+        result.statements[0]
+    );
+    assert!(result.statements[0].contains("CREATED_AT DATE DEFAULT SYSDATE NOT NULL"), "ddl: {}", result.statements[0]);
+    assert!(!result.statements[0].contains("NOT NULL DEFAULT"), "ddl: {}", result.statements[0]);
+}
+
 #[test]
 fn oracle_create_table_preserves_character_length_units() {
     let mut byte_col = column("BYTE_COL");