select from one table, count from another where id's linked

Question

heres my code:

$sql = mysql_query(\"select c.name, c.address, c.postcode, c.dob, c.mobile, c.email, 
                    count(select * from bookings where b         


        

Answer 1

Your query incorrectly uses COUNT, which has been covered by @Will A's answer.

I would also like to suggest a possibly better constructed alternative, which, I think, reflects the same logic:

SELECT
  c.name,
  c.address,
  c.postcode,
  c.dob,
  c.mobile,
  c.email,
  COUNT(*) AS purchased,
  COUNT(b.the_date > $now OR NULL) AS remaining
FROM customers AS c
  INNER JOIN bookings AS b ON b.id_customer = c.id
GROUP BY c.id
ORDER BY c.name ASC

Note: Normally you are expected to include all the non-aggregated SELECT expressions into GROUP BY. However MySQL supports shortened GROUP BY lists, so it's enough to specify the key expressions that uniquely identify all the non-aggregated data you are pulling. Please avoid using the feature arbitrarily. If a column not included in GROUP BY has more than one value per group, you have no control over which value will actually be returned when pulling that column without aggregation.