Question

select e.deptno,s.grade,sum(sal)
from emp e ,  salgrade s
where (e.sal between s.losal and s.hisal)

 group by e.deptno,s.grade
 order by e.deptno,s.grade;

我无法在查询中显示缺少成绩的0工资

Answer 1

从不在FROM子句中使用逗号。始终使用正确的，明确的，标准 JOIN语法。

您想要一个LEFT JOIN。假设您拥有所有部门的表：

select d.deptno, s.grade, sum(e.sal)
from departments d left join
     emp e
     on e.deptno = d.deptno left join
     salgrade s
     on e.sal between s.losal and s.hisal
group by d.deptno, s.grade
order by d.deptno, s.grade;

在SQL中如何按部门分组显示sal为空，部门缺少部门的成绩

1 个答案: