SQL查询重复删除帮助

我需要从下表中删除半重复记录

ID      PID      SCORE
1       1        50
2       33       20
3       1        90
4       5        55
5       7        11
6       22       34

对于存在的任何重复PID，我希望删除最低评分记录。在上面的示例中，ID 1将被删除。我试图想出一种不使用循环的方法，但我真的很挣扎

任何帮助都将不胜感激

谢谢

要保留不重复的结果，请执行以下操作：

WITH    q AS
        (
        SELECT  *,
                ROW_NUMBER() OVER (PARTITION BY pid ORDER BY score) AS rn,
                COUNT(*) OVER (PARTITION BY pid) AS cnt
        FROM    mytable
        )
DELETE
FROM    q
WHERE   rn = 1
        AND cnt > 1

---

我看不到你的查询，所以我编了这个例子

SELECT
    PID,
    MAX(Score)
FROM
    tblTable
GROUP BY
    PID

试试这个

    declare @tt table(id int, pid int,score int)
    insert into @tt
    select 1,1,50 union all
    select 2,33,50 union all
    select 8,33,80 union all
    select 3,1,90 union all
    select 4,5,50 union all
    select 5,5,10 union all
    select 6,6,10 union all
    select 7,6,50  
    ---------   
    delete from @tt where id in (
    select t1.id from @tt t1 inner join
    (
        select  MIN(score) tScore,pid tPid from @tt where pid in 
        (select  pid from @tt group by pid having count (pid) > 1) group by pid 
    ) t2 on t1.pid=t2.tPid and t1.score=t2.tScore)

    select * from @tt

---

这不会也会删除没有重复项的记录吗？您不应该按pid分区、按分数排序并删除行数为2的记录吗？@op只想删除最低的分数id，而不是所有其他的。@Mark:当然，我没有注意到@op想删除最低的分数，而不是最低的id。这会选择op不想删除其他的分数

    DELETE t.* 
    FROM Table1 t 
    JOIN (SELECT pid, MIN(score) minScore, MAX(id) maxId
            FROM Table1
        GROUP BY pid) t1 
    ON t.pid = t1.pid 
   AND t.score = t1.minScore 
   AND t.id < t1.maxId

    declare @tt table(id int, pid int,score int)
    insert into @tt
    select 1,1,50 union all
    select 2,33,50 union all
    select 8,33,80 union all
    select 3,1,90 union all
    select 4,5,50 union all
    select 5,5,10 union all
    select 6,6,10 union all
    select 7,6,50  
    ---------   
    delete from @tt where id in (
    select t1.id from @tt t1 inner join
    (
        select  MIN(score) tScore,pid tPid from @tt where pid in 
        (select  pid from @tt group by pid having count (pid) > 1) group by pid 
    ) t2 on t1.pid=t2.tPid and t1.score=t2.tScore)

    select * from @tt