mysql高级语法

我们一个月前来到优越国际，进入一个班叫xx SELECT * FROM emp GROUP BY deptno/*分组查询*/ SELECT deptno,sum(sal) FROM emp GROUP BY deptno/*分组查询各个小组的获取金额总数(group by 无太大意义)*/ SELECT emp.empno,emp.ename,emp.sal,emp.deptno,dept.dn

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