Question

I have USER table(master table) and ONLINE table(refrence table with one to one relationship with USER) like below:
I used left join on tables

I am applying order by on “is_logged” field of ONLINE Table.(ASC)
And I got the records in assending order, but all records are coming first which are not present in ONLINE table.
I want to all record of user table order but those records should be come last which are not present in online table

Answer 1

Check this out.

SELECT  o.*
FROM     users u
             LEFT JOIN online 
                 o ON u.id = o.user_id
ORDER BY COALESCE(is_logged, -1) DESC, user_id ASC

SQLFiddle Demo