sql count(1)不要和查询数据混用 非常耗时

count(1)不要和查询数据混用 非常耗时

例子:

SELECT  w.[PKID],
        COUNT(1) OVER() AS TotalCount
FROM w  WITH(NOLOCK)
INNER JOIN  s WITH(NOLOCK)
    ON s.PKID= w.SID
INNER JOIN s2 WITH (NOLOCK)
    ON s2.PKID= w.SID2
INNER JOIN w2 AS WTLWITH(NOLOCK)
    ON W2.WID=w.PKID
ORDER BY w.PKID 
OFFSET 0 ROW FETCH NEXT 15 ROW ONLY
posted @ 2017-11-27 17:57  Lulus  阅读(1108)  评论(0编辑  收藏  举报