Question

需要在多列中找到包含重复数据的行

hID     sid    lid    aid    did     shid    soid         date
------------------------------------------------------------------
0       123    jkn    rbr    tm      asd     hjk       10/11/2008
1       563    kjh    jkh    dfsd    we      hjk       11/12/2010
2       131    jklj   jkjk   adsd    vcv     asd       01/01/2012
3       656    hjkh   hjkh   dasda   fas     fads      03/26/2012
4       123    jkn    rbr    tm      asd     hjk       09/09/2012

应该像dis one一样回归..

hID     sid    lid    aid    did     shid    soid         date
------------------------------------------------------------------
0       123    jkn    rbr    tm      asd     hjk       10/11/2008
4       123    jkn    rbr    tm      asd     hjk       09/09/2012

有什么想法吗？提前谢谢！

Answer 1

下面的查询比@TimSchmelter的解决方案重复得多，但如果碰巧在sid, lid, aid, did, shid, soid上有索引，那么对于重复数相对较少的大型表会产生可衡量的性能优势。

SELECT t.* FROM t INNER JOIN (
  SELECT sid, lid, aid, did, shid, soid, COUNT(1) AS count FROM t
  GROUP BY sid, lid, aid, did, shid, soid HAVING COUNT(1) > 1
) tt ON t.sid=tt.sid AND t.lid=tt.lid AND t.aid=tt.aid AND t.did=tt.did AND t.shid=tt.shid AND t.soid=tt.soid;

Answer 2

您可以GROUP BY多列。但是，由于您要查找所有重复项，可以使用EXISTS：

SELECT
   hID, sid, lid, aid, did, shid, soid, date
FROM TableName t1
WHERE EXISTS
(
   SELECT 1 FROM TableName t2
   WHERE t2.hid <> t1.hid
   AND  t2.sid  = t1.sid   
   AND  t2.lid  = t1.lid    
   AND  t2.aid  = t1.aid   
   AND  t2.did  = t2.did
   AND  t2.shid = t2.shid   
   AND  t2.soid = t2.soid
)

Answer 3

这适用于我尝试的所有SQL服务器（SQLFiddle）：

SELECT * FROM t
WHERE (sid,lid,aid,did,shid,soid) IN (
    SELECT sid,lid,aid,did,shid,soid
    FROM t
    Group By 1,2,3,4,5,6
    HAVING count(1) > 1
)

Answer 4

;with tempTable as
(
select *, row_number() over(partition by sid, lid, aid, did, shid, soid order by hid asc )  as rowid
from #table)
select *
from tempTable
where rowid>1

查询在多列上搜索重复行

4 个答案: