SQL查詢從表中獲取不存在的記錄

Question

我有4張桌子
表格1
UserId（PK）---------- UserName
1 ------------------ ABC
2 ------------------- PQR

表2
CUSTID（PK）---------的CustName
1 ----------------------- Cust1
2 ----------------------- Cust2
3 ----------------------- Cust3

表3
CUSTID（FK）----------用戶ID（FK）
1 ----------------------- 1
2 ----------------------- 2

表4
OfficeId（PK）---------- OfficeName -------- CUSTID（FK）
1 ------------------------關閉1 ------------------- 1
2 ------------------------關閉2 ------------------- 1
3 ------------------------關閉3 ------------------- 2

Tabl5
OfficeId（FK）----------用戶ID
1 ------------------------- 1
3 ------------------------- 2

問題是，當用戶與3個Cust關聯時，但他被分配的辦公室僅屬於2個Cust，那么它應該返回未分配的officeId？ 在上面的表格中
當我將UserId = 1傳遞給存儲過程時
我想要以下輸出

OfficeId --------- OfficeName
2 -----------------關閉2

Answer 1

SELECT OfficeId, OfficeName
FROM Table4
WHERE OfficeId NOT IN (
    SELECT Table4.OfficeId
    FROM Table3
    INNER JOIN Table4
        ON Table3.CustId = Table4.CustId
    INNER JOIN Tabl5
        ON Tabl5.UserId = Tabl3.UserId
        AND Tabl5.OfficeId = Table4.OfficeId
);

Answer 2

我不想跟蹤哪個表是哪個表，所以我使用的表名對我來說更有意義。

使用not exists()

select o.OfficeId, o.OfficeName
from users_customers uc
  inner join office o
    on uc.CustId = o.CustId
where uc.UserId = @UserId
  and not exists (
    select 1
    from users_office uo
    where uo.UserId = @UserId
      and uo.OfficeId = o.OfficeId
  )

使用except （這也會刪除重復的結果）

select o.OfficeId, o.OfficeName
from users_customers uc
  inner join office o
    on uc.CustId = o.CustId
where uc.UserId = @UserId

except

select o.OfficeId, o.OfficeName
from users_office uo
  inner join office o 
    on uo.OfficeId = o.OfficeId
where uo.UserId = @UserId