在UPDATE中更新TOP条数据以及UPDATE更新中使用ORDER BY

正常查询语句中TOP的运用:

SELECT TOP 1000 *

FROM MP_MemberGrade

 

随意更新一张表中满足条件的前N条数据:

UPDATE TOP (1) MP_Member SET FKGradeID=2

WHERE IsDeleted=2

 

更新A表中满足B表前N条记录的数据

UPDATE MP_Member SET FKGradeID=2

FROM MP_Member A

LEFT JOIN (SELECT TOP 10 * FROM MP_MemberGrade WHERE IsDeleted=2) B ON A.FKGradeID=B.PKID

WHERE A.IsDeleted=2

或

UPDATE MP_Member SET FKGradeID=4

FROM (SELECT TOP 10 * FROM MP_MemberGrade WHERE IsDeleted=2) B

WHERE MP_Member.IsDeleted=2 AND FKGradeID=B.PKID

 

UPDATE更新中使用ORDER BY

UPDATE MP_Member SET FKGradeID=2

FROM MP_Member A

LEFT JOIN (SELECT TOP 10 * FROM MP_MemberGrade WHERE IsDeleted=2 ORDER BY PKID DESC) B ON A.FKGradeID=B.PKID

WHERE A.IsDeleted=2

ORDER BY 子句在视图、内联函数、派生表、子查询和公用表表达式中无效，除非另外还指定了 TOP 或 FOR XML。