Question

I have following SQL code:

SELECT m.email
FROM members as m
WHERE exists 
(
select * 
from posts as p
where p.email = m.email
)
order by ads desc

I want to add another statement before “exists”, so that I have something like

SELECT m.email
FROM members as m
WHERE 
(m.ads<>0) 
and 
exists 
(
select * 
from posts as p
where p.email = m.email
)
order by ads desc

but it doesn’t work, as well as ads<>'0', ads<>('0'), m.ads<>0 etc.

Why do you think it’s not working?

By “Doesn’t Work” I mean that when I add a line ‘ads<>0’ there is no change in query result (as if I did not enter this line).
If I add a line ‘ads=0’ instead – it gives out empty result, as if there are no fields which have a value of Zero (which actually do exist)

Answer 1

You should be able to add as many logical clauses to your WHERE statement as you wish.

Assuming members.ads is an integer data type…

SELECT m.email
FROM members m
WHERE m.ads <> 0
AND EXISTS (
    SELECT 1
    FROM posts p
    WHERE p.email = m.email
)
ORDER BY m.ads DESC