以下工作,我只是想知道这是否是找到每个审计字段的最新值的正确方法。SQL Select最佳实践
USE tempdb
CREATE Table Tbl(
TblID Int,
AuditFieldID Int,
AuditValue Int,
AuditDate Date
)
GO
INSERT INTO Tbl(TblID,AuditFieldID,AuditValue,AuditDate) VALUES(1,10,101,'1/1/2001')
INSERT INTO Tbl(TblID,AuditFieldID,AuditValue,AuditDate) VALUES(2,10,102,'1/1/2002')
INSERT INTO Tbl(TblID,AuditFieldID,AuditValue,AuditDate) VALUES(3,20,201,'1/1/2001')
INSERT INTO Tbl(TblID,AuditFieldID,AuditValue,AuditDate) VALUES(4,20,202,'1/1/2009')
SELECT AuditFieldID,AuditValue,AuditDate
FROM Tbl A
WHERE TblID=
(SELECT TOP 1 TblID
FROM Tbl
WHERE AuditFieldID=A.AuditFieldID
ORDER BY AuditDate DESC
)
SQL服务器....?你应该指定你正在使用哪种技术... – womp 2009-07-29 22:21:27