Sql server 2008 案例陈述或类似技巧
我试图使用案例陈述,但我没有得到我想要的答案 代码如下:Sql server 2008 案例陈述或类似技巧,sql-server-2008,case,Sql Server 2008,Case,我试图使用案例陈述,但我没有得到我想要的答案 代码如下: DECLARE @Table TABLE (DocID INT, DocNumber VARCHAR(10),DocDevStat INT, MilestoneDate DATETIME, MilestoneID INT) INSERT INTO @Table VALUES (30, '14-1', 6, '10-01-2001', 10) INSERT INTO @Table VALU
DECLARE @Table TABLE (DocID INT, DocNumber VARCHAR(10),DocDevStat INT, MilestoneDate DATETIME,
MilestoneID INT)
INSERT INTO @Table VALUES (30, '14-1', 6, '10-01-2001', 10)
INSERT INTO @Table VALUES (30, '14-1', 6, '10-15-2001', 11)
INSERT INTO @Table VALUES (30, '14-1', 6, '11-06-2002', 13)
INSERT INTO @Table VALUES (30, '14-1', 6, '11-01-2003', 27)
INSERT INTO @Table VALUES (30, '14-1', 6, '11-01-2003', 30)
INSERT INTO @Table VALUES (30, '14-1', 6, '03-01-2004', 28)
INSERT INTO @Table VALUES (30, '14-1', 6, '03-01-2004', 35)
INSERT INTO @Table VALUES (31, '14-3', 2, '06-27-2003', 10)
INSERT INTO @Table VALUES (31, '14-3', 2, '05-05-2004', 27)
INSERT INTO @Table VALUES (31, '14-3', 2, '05-05-2004', 30)
INSERT INTO @Table VALUES (31, '14-3', 2, '07-20-2005', 35)
INSERT INTO @Table VALUES (31, '14-3', 2, '08-31-2005', 32)
INSERT INTO @Table VALUES (36, '1-2', 7, '10-01-1996', 10)
INSERT INTO @Table VALUES (36, '1-2', 7, '10-01-1996', 11)
INSERT INTO @Table VALUES (36, '1-2', 7, '12-01-1996', 28)
INSERT INTO @Table VALUES (36, '1-2', 7, '12-01-1996', 35)
Select distinct t.Docid, t.DocNumber,
case when t.DocDevStat IN (6,7,8) and t.MilestoneID = 35 then Max(t.Milestonedate)
when t.DocDevStat IN (2,3,4) then Convert(date,GETDATE()) end AS LatestDate
FROM @Table t
Group By t.DocID, t.DocNumber, t.DocDevStat, t.MilestoneID
我得到的结果是:
Docid DocNumber LatestDate
30 14-1 NULL
30 14-1 2004-03-01
31 14-3 2012-10-17
36 1-2 NULL
36 1-2 1996-12-01
但我想得到:
Docid DocNumber LatestDate
30 14-1 2004-03-01
31 14-3 2012-10-17
36 1-2 1996-12-01
在本例中使用的CASE语句是否正确
Select DISTINCT t.Docid, t.DocNumber,
case when t.DocDevStat IN (6,7,8) then Max(t.Milestonedate)
when t.DocDevStat IN (2,3,4) then Convert(date,GETDATE()) end AS LatestDate
FROM @Table t
where t.DocDevStat IN (2,3,4) OR (t.DocDevStat IN (6,7,8) and t.MilestoneID = 35)
Group By t.DocID, t.DocNumber, t.DocDevStat, t.MilestoneID
此查询返回您要查找的数据。我将您正在搜索的条件添加到where子句中。Yes
CASE
最好使用,即使您可以检查是否存在
Addt.DocDevStat
和t.MilestoneID
列到输出中。然后你就能看到出了什么问题。