使用sql从表中获取不可用值列表

Question

我在sql server 2008中有下表,有医院id和他们的部门:

HID    DEPT
5   neuro
2   derma
3   cardio
2   ent
1   neuro
5   optha
3   ent
3   optha
4   derma
1   optha
5   derma

需要使用sql获取它没有的id和部门名称列表.例如:

HID   DEPT
 1    derma
 1    cardio
 1    ent
 2    cardio
 2    neuro
 2    optha

等等谢谢

Answer 1

试试这个:

;WITH CTE AS
(
    SELECT *
    FROM (  SELECT DISTINCT HID
            FROM YourTable) A
    CROSS JOIN (SELECT DISTINCT DEPT
                FROM YourTable) B
)
SELECT *
FROM CTE A
WHERE NOT EXISTS(SELECT 1 FROM YourTable
                 WHERE HID = A.HID AND DEPT = A.DEPT)

这是一个带有演示的sqlfiddle.