diff --git a/多表查询.md b/多表查询.md
index b026a1f..b582c7f 100644
--- a/多表查询.md
+++ b/多表查询.md
@@ -119,7 +119,7 @@ fsql.Select<Topic>().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 ',') 
+//SELECT a.`Id`, (SELECT group_concat(b.`Id` separator ',') 
 //    FROM `StringJoin01` b) 
 //FROM `Topic` a
 ```