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我有两个表如下:选择表1中的所有行和表的填写栏2
表1:
ID | FName | LName
1 | A1 | A2
2 | B1 | B2
3 | C1 | C2
表2:
ID | Price | Month | T1ID
1 | 5 | 1 | 1
2 | 5 | 1 | 2
3 | 5 | 2 | 3
结果:
哪里月='1'
ID | FName | LName | Price | Month | T1ID
1 | A1 | A2 | 5 | 1 | 1
2 | B1 | B2 | 5 | 1 | 2
NULL| C1 | C2 | NULL | NULL | 3
WHERE月份=“2”
ID | FName | LName | Price | Month | T1ID
NULL| A1 | A2 | NULL | NULL | 1
NULL| B1 | B2 | NULL | NULL | 2
3 | C1 | C2 | 5 | 2 | 3