接上贴,多表查询中重复的问题.

CREATE TABLE #a
(
RiQi date,
aTest NVARCHAR(20)
)
CREATE TABLE #b
(
RiQi Date,
BTest NVARCHAR(20)
)
INSERT INTO #a(    RiQi,    aTest)VALUES('2013-06-11','开支-吃饭')
INSERT INTO #a(    RiQi,    aTest)VALUES('2013-06-11','开支-洗脚')
INSERT INTO #b(    RiQi,    BTest)VALUES('2013-06-11','供应商-联想')

--想要的结果
#a.RiQi   #a.aTest    #b.RiQi    #b. BTest
-------------------------------------------
2013-06-11  开支-吃饭  2013-06-11  供应商-联想
2013-06-11  开支-洗脚  NULL        NULL

两表没有什么关系,就是需要查询相同天数的开支与供应商.不能有重复.如果B表数据多,A表数据记录少,那就用NULL表示
[解决办法]
这样?

USE tempdb
GO
CREATE TABLE #a
(
RiQi date,
aTest NVARCHAR(20)
)
CREATE TABLE #b
(
RiQi Date,
BTest NVARCHAR(20)
)
INSERT INTO #a(    RiQi,    aTest)VALUES('2013-06-11','开支-吃饭')
INSERT INTO #a(    RiQi,    aTest)VALUES('2013-06-11','开支-洗脚')
INSERT INTO #b(    RiQi,    BTest)VALUES('2013-06-11','供应商-联想')

SELECT 
a.RiQi,a.aTest,b.RiQi,BTest
FROM 
(SELECT *,Row=ROW_NUMBER()OVER(PARTITION BY RiQi ORDER BY RiQi) FROM #a) AS a
FULL JOIN 
(SELECT *,Row=ROW_NUMBER()OVER(PARTITION BY RiQi ORDER BY RiQi) FROM #b) AS b ON a.RiQi=b.RiQi AND a.Row=b.Row

/*
RiQiaTestRiQiBTest
2013-06-11开支-吃饭2013-06-11供应商-联想
2013-06-11开支-洗脚NULLNULL
*/