sql server兩表關係查詢

來源:互聯網
上載者:User

1、建立兩個表格table1和table2,表結構如下:

2、初始化表格式資料

table1

1

a20050111

2

a20050112

3

a20050113

4

a20050114

5

a20050115

table2

1

2006032401

2

2006032402

3

2006032403

4

2006032404

8

2006032408

3、where查詢

select *

from table1 a,table2 b

where a.aid=b.bid

查詢結果:

1       a20050111       1       2006032401

2       a20050112       2       2006032402

3       a20050113       3       2006032403

4       a20050114       4       2006032404

4、left join查詢

select *

from table1 a

left join table2 b

on a.aid=b.bid

查詢結果:

1       a20050111       1       2006032401

2       a20050112       2       2006032402

3       a20050113       3       2006032403

4       a20050114       4       2006032404

5       a20050115       NULL         NULL

5、right join查詢

select *

from table1 a

right join table2 b

on a.aid=b.bid

查詢結果:

1       a20050111       1       2006032401

2       a20050112       2       2006032402

3       a20050113       3       2006032403

4       a20050114       4       2006032404

NULL         NULL         8       2006032408

6、inner join查詢

select *

from table1 a

inner join table2 b

on a.aid=b.bid

查詢結果:

1       a20050111       1       2006032401

2       a20050112       2       2006032402

3       a20050113       3       2006032403

4       a20050114       4       2006032404

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