Question

表名Queue_Demo

SnipID  UserID
AAQXFU  179
AAQXFU  161
AAQXFU  164
AATEGD  161
AATEGD  164
AATEGD  179
AATSIE  179
AATSIE  161
AATSIE  164

如果UserID例如179来问SnipID，他会得到AAQXFU 因此，应从Queue_Demo表中删除SnipID。

我的Get方法

set nocount on;
with cte as (
    select top(1) SnipID
    from dbDataEntry.Queue_Demo  with (rowlock, readpast)
    where UserID =179 
    order by SnipID
)
delete from cte
output deleted.SnipID;

此方法仅用UserID 179删除一行。但是带有AAQXFU的另一行仍然在那里。

编辑： 我想要的是。是要删除AAQXFU

中的每条记录

Answer 1

您也可以这样做

set nocount on;
with cte as (
    select top(1) SnipID
    from dbDataEntry.Queue_Demo with (rowlock, readpast)
    where UserID =179 
    order by SnipID
)

delete  a output DELETED.snipid from dbDataEntry.Queue_Demo a 
inner join cte b on a.snipid = b.snipid

编辑-将输出添加到查询

Answer 2

使用您的测试数据，这会删除SnipID等于AAQXFU的所有行

DELETE FROM dbDataEntry.Queue_Demo 
OUTPUT DELETED.SnipID
WHERE
   SnipID = (SELECT min(SnipID) FROM dbDataEntry.Queue_Demo WHERE UserID = 179)

Answer 3

您似乎想要row_number()函数：

delete t
from (select *, row_number () over (partition by userid order by snipid) as seq
      from dbDataEntry.Queue_Demo
     ) t
where t.userid = 179 and
      seq > 1;

Answer 4

DELETE a FROM dbDataEntry.Queue_Demo a
WHERE 
 EXISTS (SELECT 1 FROM dbDataEntry.Queue_Demo WHERE UserId = 179 AND SnipID = a.SnipID)

使用where子句删除CTE

4 个答案: