SQL SELECT to get company status based on working hours - mysql

Question

I'm trying to execute a SQL SELECT query to get all the stores within a city and also have a field to inform if the store is within working hours or not.
This is the SQL I have so far:
$day = date('w');
$hour = date('H:i:s');
SELECT a.id, a.rating, a.name, a.image, b.cityName
(
SELECT 1 FROM tbStore a, workingHour b
WHERE a.id = b.id_store
AND b.weekDay = '$day'
AND b.hourOpen <= '$hour'
AND b.hourClose >= '$hour')
) as 'open'
FROM tbStore a, tbCity b
WHERE b.url = '$url'
AND a.id_city = b.id
ORDER BY open
The way I'm checking this value is as a boolean, so the 'open' field needs to be 0 (closed) or 1 (open).
It's kind of working... But the problem is, if just 1 store is within working hours, all of the others will be 'open' as well, instead of just that specific store.
I also saw some sql statements where people use CASE instead of another select, so any other type of code can be used, as long as the final result is correct.

Answer 1

You're redefining the tbStore a and losing the restriction by $url. You probably just need to change:
SELECT 1 FROM tbStore a, workingHour b
To:
SELECT 1 FROM workingHour b

Answer 2

I have just rewrite you query using explict join way
SELECT
a.id
, a.rating
, a.name
, a.image
, b.cityName
, when( c.id_store is not null then 1 else 0 end) as open
FROM tbStore a
inner join tbCity b on a.id_city = b.id
LEFT join workingHour c on a.id = c.id_store
WHERE b.url = '$url'
AND c.weekDay = '$day'
AND c.hourOpen <= '$hour'
AND c.hourClose >= '$hour'
ORDER BY open