update

嵌套查询.md

@@ -18,7 +18,7 @@ fsql.Select<User1>()
 ```sql
 SELECT *
 FROM (
-    SELECT a.[CreateTime], a.[UpdateTime], a.[IsDeleted], a.[Sort], a.[Id], a.[GroupId], a.[Username], a.[Nickname], a.[Avatar], a.[Description], row_number() over( partition by a.[Nickname] order by a.[Id]) [rownum]
+    SELECT a.[Id], a.[Username], a.[Nickname], row_number() over( partition by a.[Nickname] order by a.[Id]) [rownum]
     FROM [User1] a
 ) a
 WHERE (a.[rownum] = 1)
@@ -34,13 +34,29 @@ WHERE (a.[rownum] = 1)
 
 ## ToSql + WithSql
 
+这是早期提供的嵌套查询方法
+
 ```csharp
-fsql.Select<Topic>()
-  .WithSql("select * from Topic where clicks > @val", new { val = 10 })
-  .Page(1, 10)
-  .ToList()
-//SELECT a.`Id`, a.`Clicks`, a.`CategoryId`, a.`Title`, a.`CreateTime` 
-//FROM (select * from Topic where clicks > @val) a 
+var sql = fsql.Select<User1>()
+    .ToSql(a => new
+    {
+        item = a,
+        rownum = SqlExt.RowNumber().Over().PartitionBy(a.Nickname).OrderBy(a.Id).ToValue()
+    }, FieldAliasOptions.AsProperty);
+
+fsql.Select<User1>()
+    .WithSql(sql)
+    .Where("a.rownum = 1")
+    .ToList();
+```
+
+```sql
+SELECT a.[Id], a.[Username], a.[Nickname] 
+FROM (
+    SELECT a.[Id], a.[Username], a.[Nickname], row_number() over( partition by a.[Nickname] order by a.[Id]) [rownum]
+    FROM [User1] a
+) a
+WHERE (a.rownum = 1)
 ```
 
 ## 参考资料