選擇某些值不在其他表中的行

Question

表T3的A和B與來自T1的A和B相同。 基本上我需要做的是選擇所有不在T3上的值。 如果在T3上有一條與A，B相連的線我不想展示它。

SELECT T1.A, T1.B, T1.C 
FROM T1, T2 
WHERE T1.X=T2.X 
AND NOT EXISTS 
(
    SELECT T3.A, T3.B 
    FROM T3 
) 

任何幫助？ 感謝

Answer 1

SELECT T1.A, T1.B, T1.C 
FROM T1 INNER JOIN T2 ON T1.X=T2.X 
WHERE NOT EXISTS 
(
    SELECT 1 FROM T3 
    WHERE T3.A = T1.A AND T3.B = T1.B 
) 

Answer 2

select T1.A,T1.B,T1.C 
from T1 
inner join T2 
on T1.X=T2.X 
left join T3 on T1.A=T3.A and T1.B=T3.B 
where T3.A is null 

Answer 3

你也可以做到這一點使用子查詢像

SELECT T1.A, T1.B, T1.C 
FROM T1, T2 
WHERE T1.X=T2.X 
AND T1.A NOT IN (SELECT T3.A FROM T3) 
AND T2.B Not IN (SELECT T3.B FROM T3) 

Answer 4

SELECT T1.A, T1.B, T1.C 
FROM T1, T2 
WHERE T1.X=T2.X 
AND (T1.A, T1.B) NOT IN (SELECT T3.A, T3.B FROM T3)