SQL統計部門人數,人數爲0的部門也要顯示出來

  相同點：它們都以一張部門表（或類別表），其它表都有部門編號DepartmentID（類別編號）html 案例一：一張表post  select c.DepartmentID,c.DepartmentName, t.Num AS '人員數量' from T_Department as c  left join (select DepartmentID,COUNT(*) AS Num from T

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