求sql语句,根据两张表的相同字段插入到第三张表
我现在有两张表A 和 B
现在A表里有个字段是:zhanghao,B字段里有个字段也是:zhanghao,
我现在想把A表里的数据和B表里是数据根据A表和B表相同字段相等,插入到第三张表中,怎么写SQL语句,用的mysql数据库,
谢谢大家了。
------解决方案--------------------
insert into test_C(
select * from test_A where test_A.zhanghao in(select test_b.zhanghao from test_B)
)
------解决方案--------------------
INSERT INTO C SELECT * FROM A;
INSERT INTO C SELECT * FROM B INNER JOIN A ON A.zhanghao = B.zhanghao;
------解决方案--------------------
insert into c
select * from a,b where a.zhanghao=b.zhanghao
*根据你自己的需求改成对应的字段
------解决方案--------------------
insert into test_c(zhanghao)(
select zhanghao from test_a where test_a.zhanghao in(select test_b.zhanghao from test_b)
)
第一次回答是三个表相同才能那样插入
对于不同字段不同,只对一个字段进行比较操作,用这个,只比对插入zhanghao字段
test_a为你说的A表
------解决方案--------------------
INSERT INTO C SELECT * FROM A,B where A.zhanghao = B.zhanghao;

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