insert into c(a+,b) select a+,b from a,b这个是a表的悔悉a+字碧拿乎段和B表的b字段无关联的情况下,如果是有关联的话加上left join 就可以了敏迟
表A、腊贺表B与表C应该有个颤局迅关联的字段吧比茄此如ID吧insert into C(c) select A.a+B.b from A inner join B on A.ID=B.ID