Question

Tables:

helps (important are id and fecha fields)

shared helps (helps referenced by other users with a different date)

So,

All helps from a user (user_id = 1)

SELECT * FROM helps WHERE id_user = 1

All helps from user and the ones he refferenced

SELECT * FROM helps where id_user = 1 or id IN (SELECT helpid FROM shared_helps WHERE userid = 1)

I know you guys will find it a very ugly query (I hoped you could show me the light) but it seems to show the results I want. Problem is that this way shared_helps.fecha is ignored so it makes no effect in the ORDER BY, how can I achieve this?

Answer 1

SELECT
  helps.*
FROM
  helps
LEFT JOIN
  shared_helps
    ON  shared_helps.helpid = helps.id
    AND shared_helps.userid = 1
WHERE
     helps.id_user = 1
  OR shared_helps.userid = 1
ORDER BY
  CASE WHEN helps.id_user = 1 THEN 0 ELSE 1 END,
  shared_helps.fecha

EDIT

Based on your comment, try this…

ORDER BY
  COALESCE(shared_helps.fecha, helps.fecha)

Or possibly this…

ORDER BY
  helps.fecha

I’m honestly not 100% certain what you need. Perhaps you could include some sample data and the output you desire for that sampel data?