diff --git a/多表查询.md b/多表查询.md
index a94e55a..6bf3526 100644
--- a/多表查询.md
+++ b/多表查询.md
@@ -114,10 +114,12 @@ fsql.Select<Topic>()
 
 ```csharp
 fsql.Select<Topic>()
-  .Where(a => string.Join(",", fsql.Select<StringJoin01>().ToList(b => b.Id))
-  .ToList();
-//SELECT (SELECT group_concat(b.`name` separator ',') 
-//    FROM `StringJoin01` b) as1 
+  .ToList(a => new {
+    id = a.Id,
+    concat = string.Join(",", fsql.Select<StringJoin01>().ToList(b => b.Id))
+  });
+//SELECT a.`Id`, (SELECT group_concat(b.`name` separator ',') 
+//    FROM `StringJoin01` b) 
 //FROM `Topic` a
 ```