Question

可能重复：
How to join two tables

表1

Date         StartingAum

07/01/2010     120
08/01/2010     220
09/01/2010     320

表2

Date          DepContr   withdra    
01/01/2010      60          15
02/01/2010      70          25
03/01/2010      80          15
04/01/2010      30          89 
05/01/2010      40          15
06/01/2010      25          85
07/01/2010      16          17   
08/01/2010      19          21
09/01/2010      68          79

输出应为

Date         StartingAum     DepContr   withdra    
01/01/2010      0              60          15
02/01/2010      0              70          25
03/01/2010      0              80          15
04/01/2010      0              30          89 
05/01/2010      0              40          15
06/01/2010      0              25          85
07/01/2010     120             16          17   
08/01/2010     220             19          21
09/01/2010     320             68          79

我需要与

完全相似的输出

Answer 1

DECLARE @Table1 table ([date] datetime, StartingAum int)
DECLARE @Table2 table ([date] datetime, DepContr int, withdra int)
INSERT @Table1 VALUES ('07/01/2010',     120)
INSERT @Table1 VALUES ('08/01/2010',     220)
INSERT @Table1 VALUES ('09/01/2010',     320)

INSERT @Table2 VALUES ('01/01/2010',      60 ,         15)
INSERT @Table2 VALUES ('02/01/2010',      70 ,         25)
INSERT @Table2 VALUES ('03/01/2010',      80 ,         15)
INSERT @Table2 VALUES ('04/01/2010',      30 ,         89)
INSERT @Table2 VALUES ('05/01/2010',      40 ,         15)
INSERT @Table2 VALUES ('06/01/2010',      25 ,         85)
INSERT @Table2 VALUES ('07/01/2010',      16 ,         17)
INSERT @Table2 VALUES ('08/01/2010',      19 ,         21)
INSERT @Table2 VALUES ('09/01/2010',      68 ,         79)


SELECT 
    t2.[Date]
        ,ISNULL(t1.StartingAum, 0) AS StartingAum     
        ,t2.DepContr
        ,t2.withdra   
    FROM @Table2           t2
        LEFT JOIN @Table1  t1 ON t2.[Date] = t1.[Date]
    ORDER BY t2.[Date]

输出：

Date                    StartingAum DepContr    withdra
----------------------- ----------- ----------- -----------
2010-01-01 00:00:00.000 0           60          15
2010-02-01 00:00:00.000 0           70          25
2010-03-01 00:00:00.000 0           80          15
2010-04-01 00:00:00.000 0           30          89
2010-05-01 00:00:00.000 0           40          15
2010-06-01 00:00:00.000 0           25          85
2010-07-01 00:00:00.000 120         16          17
2010-08-01 00:00:00.000 220         19          21
2010-09-01 00:00:00.000 320         68          79

Answer 2

我想你应该看看这个页面：http://www.w3schools.com/sql/sql_union.asp 那可能有帮助吗？

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