Question

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

I have a table like above and I want to select model_ids only where property equals to 1 AND 3

I’d be glad if you could show me how

Answer 1

Sounds like you want this:

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

See SQL Fiddle with Demo

Or you can use the following:

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)

See SQL Fiddle with Demo