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diff --git a/apps/desktop/src/lib/__tests__/tabs/tabPresentation.spec.ts b/apps/desktop/src/lib/__tests__/tabs/tabPresentation.spec.ts
index 441aec3a91..1f3230e2bf 100644
--- a/apps/desktop/src/lib/__tests__/tabs/tabPresentation.spec.ts
+++ b/apps/desktop/src/lib/__tests__/tabs/tabPresentation.spec.ts
@@ -188,6 +188,38 @@ describe("query result labels", () => {
     expect(item?.title).toBe("SELECT 1");
   });
 
+  it("bounds the SQL fallback tooltip for results without a source object", () => {
+    const longSql = `SELECT * FROM (${Array.from({ length: 40 }, (_, i) => `SELECT ${i + 1} AS value`).join(" UNION ALL ")}) AS combined`;
+    const [item] = tabularResultItems([
+      {
+        columns: ["value"],
+        rows: [[1]],
+        affected_rows: 0,
+        execution_time_ms: 1,
+        sourceStatement: longSql,
+      },
+    ]);
+
+    const expected = `${longSql.replace(/\s+/g, " ").trim().slice(0, 160)}…`;
+    expect(item?.label).toBeUndefined();
+    expect(item?.title).toBe(expected);
+    expect(item?.title!.length).toBe(161);
+  });
+
+  it("collapses multiline SQL fallback tooltips onto a single line", () => {
+    const [item] = tabularResultItems([
+      {
+        columns: ["id"],
+        rows: [[1]],
+        affected_rows: 0,
+        execution_time_ms: 1,
+        sourceStatement: "SELECT *\n  FROM (SELECT id\n          FROM users)",
+      },
+    ]);
+
+    expect(item?.title).toBe("SELECT * FROM (SELECT id FROM users)");
+  });
+
   it("shows only the object name when result set names exclude the database", () => {
     const results = [
       {
diff --git a/apps/desktop/src/lib/tabs/tabPresentation.ts b/apps/desktop/src/lib/tabs/tabPresentation.ts
index 669c042d45..2726c2ba54 100644
--- a/apps/desktop/src/lib/tabs/tabPresentation.ts
+++ b/apps/desktop/src/lib/tabs/tabPresentation.ts
@@ -463,6 +463,14 @@ export function middleEllipsis(value: string, maxLength = 24): string {
   return `${value.slice(0, startLength)}...${end}`;
 }
 
+// 无来源对象的结果（如外层 SELECT * FROM (...) 包装查询）页签 tooltip 会回退到 SQL 文本；
+// 整条语句会把浮层撑成遮挡工作区的巨块并拦截点击，这里折叠空白并限制长度 (#13266)
+export function sourceStatementTooltip(statement: string | undefined, maxLength = 160): string | undefined {
+  const singleLine = statement?.replace(/\s+/g, " ").trim();
+  if (!singleLine) return undefined;
+  return singleLine.length > maxLength ? `${singleLine.slice(0, maxLength)}…` : singleLine;
+}
+
 export function resultSqlForGrid(tab: Pick<QueryTab, "result" | "resultBaseSql" | "lastExecutedSql" | "sql">): string {
   return tab.result?.sourceStatement || tab.resultBaseSql || tab.lastExecutedSql || tab.sql;
 }
@@ -602,7 +610,7 @@ export function tabularResultItems(results: QueryResult[] | undefined, options:
         label: displaySource,
         displayLabel,
         labelTruncated: !!displaySource && displayLabel !== displaySource,
-        title: item.result.sourceLabel || item.result.sourceStatement,
+        title: item.result.sourceLabel || sourceStatementTooltip(item.result.sourceStatement),
       };
     });
 }