如何從查詢中排除某些條目 [SQL]

Question

我確實有以下問題：假設您有一個如下所示的表：

"ExampleTable"

NotPrimID     Number
0             13
0             13
0             14
1             14
1             14
2             13
2             13

問：我想有一個query ，這將提供所有的NotPrimID的其中確實有Number為13，然而，如果Number一的NotPrimID也是14等，應該從列表中自動排除。

Answer 1

如果您只想要 ID，請使用group by並having ：

select notprimid
from t
where number in (13, 14)
group by notprimid
having max(number) = 13;  -- has 13 but not 14

如果你想要原始行，一種方法是exists / not exists ：

select t.*
from t
where exists (select 1 
              from t t2
              where t2.notprimid = t.notprimids and
                     t2.number = 13
             ) and
      not exists (select 1 
                  from t t2
                  where t2.notprimid = t.notprimids and
                        t2.number = 14
                 );

Answer 2

您可以在此處使用存在邏輯：

SELECT DISTINCT NotPrimID
FROM ExampleTable t1
WHERE Number = 13 AND NOT EXISTS (SELECT 1 FROM ExampleTable t2
                                  WHERE t2.NotPrimID = t1.NotPrimID AND t2.Number = 14);

演示