MySQL通过引用一个数据字段来选择多行

Question

===========================
= id = model_id = property =
===========================
= 14 = 1        = 1       =
===========================
= 15 = 1        = 3       =
===========================
= 16 = 2        = 1       =

我有一个像上面这样的表，我只想选择属性等于 1 AND 3 的 model_ids

如果您能告诉我如何做，我会很高兴

Answer 1

听起来你想要这个:

select model_id
from yourtable
where property in (1, 3)
group by model_id
having count(*) > 1;

参见SQL Fiddle with Demo

或者您可以使用以下内容:

select model_id
from yourtable t1
where property = 1
  and exists (select model_id
              from yourtable t2
              where t1.model_id = t2.model_id
                and property = 3)

参见SQL Fiddle with Demo