一条巧妙的SQL语句
需求:从学生表中查询出所有姓名和班级都相同的学生信息。
SQL:select distinct name,class,count(*) as recordcount from student group by name,class having count(*)>1;
需求:从学生表中查询出所有姓名和班级都相同的学生信息。
SQL:select distinct name,class,count(*) as recordcount from student group by name,class having count(*)>1;