sql 表中删除字段重复的行

Posted 2020-08-30 wood132

Id    Email    UserName
1    [email protected]    TaiseerJoudeh
2    [email protected]    HasanAhmad
3    [email protected]    MoatasemAhmad
4    [email protected]    SalmaTamer
5    [email protected]    AhmadRadi
6    [email protected]    BillGates
7    [email protected]    ShareefKhaled
8    [email protected]    AramNaser
9    [email protected]    LaylaIbrahim
10    [email protected]    RemaOday
11    [email protected]    FikriHusein
12    [email protected]    ZakariHusein
13    [email protected]    LaylaIbrahim
14    [email protected]    TamerWesam
15    [email protected]    KhaledHasaan
16    [email protected]    AsaadIbrahim
17    [email protected]    TareqNassar
18    [email protected]    DianaLutfi
19    [email protected]    TamaraMalek
20    [email protected]    ArwaKamal
21    [email protected]    SalmaTamer
22    [email protected]    NisreenTamer
23    [email protected]    SalmaTamer

 

 

去掉重复的UserName

delete Student2 where Id in

(
　　　　select id from (
　　　　　　select Id, UserName,ROW_NUMBER() over (partition by UserName order by id) orderid from Student2
　　　　)t1
　　　　where t1.orderid>1
)