Question

I’m not a sql guru at all but why does this query return error?

SELECT username FROM history as h 
    WHERE username IS NOT NULL AND updated>1342555201 AND updated<1342641599
    AND WHERE (SELECT status FROM managers WHERE username=h.username) > 0

How to group out usernames with status>0 in one query using the subquery on second table containing statuses?

Answer 1

try

SELECT h.username FROM history  h 
INNER JOIN status s USING(username)
WHERE h.updated BETWEEN 1342555201 AND 1342641599
GROUP BY h.username
HAVING  s.status > 0

Note :

• INNER JOIN will always retrive NOT NULL and common value of username

• i assume that both table have same column name.if both table have different column name then change

  USING(username) with ON h.column_name = s.column_name