SQL统计部门人数,人数为0的部门也要显示出来

  相同点：它们都以一张部门表（或类别表），其它表都有部门编号DepartmentID（类别编号）html 案例一：一张表post  select c.DepartmentID,c.DepartmentName, t.Num AS '人员数量' from T_Department as c  left join (select DepartmentID,COUNT(*) AS Num from T

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