如何从查询中排除某些条目 [SQL]

Question

我确实有以下问题：假设您有一个如下所示的表：

"ExampleTable"

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

问：我想有一个query ，这将提供所有的NotPrimID的其中确实有Number为13，然而，如果Number一的NotPrimID也是14等，应该从列表中自动排除。

Answer 1

如果您只想要 ID，请使用group by并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，一种方法是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

您可以在此处使用存在逻辑：

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