Question

I have a SQL query that has a subquery that has joins. I would like to rewrite the query without the subquery so that I can create a view. MySQL does not allow SELECT statements where the FROM is a subquery.

Is this possible? I’ve tried removing the outer select and moving the group by inside the subs query. This partially works but some of the data is incorrect.

select *
from (SELECT r.id, r.dateAdded, r.listingId, r.rating, r.username, r.valid, tbl_data.nameShort, tbl_data.desk, d.model, d.hardware, d.serial, l.appVersion, r.photoUrl, r.comment
      FROM tbl_ratings r
      JOIN tbl_data on r.listingId = vi_data.id
      JOIN tbl_devices d on r.serial = d.serial
      JOIN tbl_log l on l.serial = d.serial
      ORDER BY d.serial, l.dateAdded DESC) x
group by id
order by dateAdded DESC

Thanks in advance!

Answer 1

Is it as simple as:

SELECT     r.id, r.dateAdded, r.listingId, r.rating, r.username, r.valid,
           tbl_data.nameShort, tbl_data.desk, d.model, d.hardware,
           d.serial, l.appVersion, r.photoUrl, r.comment
      FROM tbl_ratings r
      JOIN tbl_data on r.listingId = vi_data.id
      JOIN tbl_devices d on r.serial = d.serial
      JOIN tbl_log l on l.serial = d.serial
      GROUP BY r.id
      ORDER BY r.dateAdded DESC

Also, you have a reference to “vi_data” that isn’t anywhere else in the query