sql语言问题:高手帮忙,将A和B表变成C表,sql语言怎么写,想不通了,求...答:create table a ( id int,na varchar(10))create table b ( id int,na varchar(10))create table c( id int,na varchar(10))insert into a (id,na)values ('1','a'),('2','b'),('3','c'),('4','d')insert into b (id,na)values ('1','b'),('2','b'),('5...