如何用sql语句查询两个表中完全相同的两条记录答:如何用sql语句查询两个表中完全相同的两条记录 select f1,f2,...,fn from table group by f1,f2,...,fn having count(1)>1 查出存在相同的f1,f2,..,fn 想查找出记录则 select t1.* from table t1 join (select f1,f2,...,fn from table group by f1,f2,...,fn having count(1)...
两表关联查询SQL语句的,要怎么写?答:insert into users values (4,2,'jack4', 23, '上海');insert into users values (5,3,'jack5', 23, '上海');insert into users values (6,3,'jack6', 23, '上海');3、查询表中数据;select * from users;4、编写sql,关联两张表;select * from users t , company b where t...