mysql limit inside group?

Question

I want to limit the size of records inside a group, and here is my trial, how to do it right?

mysql> select * from accounts limit 5 group by type;
         


        

Answer 1

@dnagirl's answer almost has it, but for some reason, my version of MySQL only returns the first LIMIT'd set. To get around that, I put each statement into a subquery

SELECT * FROM (
    SELECT account_type, account_balance FROM accounts WHERE account_type='savings' 
       ORDER BY account_balance DESC LIMIT 5
) as a
UNION
SELECT* FROM (
    SELECT account_type, account_balance FROM accounts WHERE account_type='chequing' 
       ORDER BY account_balance DESC LIMIT 5
) as b
UNION
SELECT * FROM (
    SELECT account_type, account_balance FROM accounts WHERE account_type='USD' 
       ORDER BY account_balance DESC LIMIT 5
) as c

This gave me back each set's results in the final result set. Otherwise, I would have only gotten the first 5 from the first query and nothing else - not sure if it's just some MySQL funk with my version