Question

我确实有以下问题：假设您有一个看起来像这样的表：

"ExampleTable"

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

问题：我想拥有一个query，它将交付所有NotPrimID为13的Number，如果Number中的NotPrimID也是 14 等，则应自动将其从列表中排除。

Answer 1

如果只需要ID，请使用group by和having：

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

如果要原始行，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

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如何从查询中排除某些条目[SQL]

2 个答案:

Demo