Question

I have the following query I use and it works great:

SELECT * FROM 

(
SELECT * FROM `Transactions` ORDER BY DATE DESC
) AS tmpTable

GROUP BY Machine
ORDER BY Machine ASC

What’s not great, is when I try to create a view from it. It says that subqueries cannot be used in a view, which is fine – I’ve searched here and on Google and most people say to break this down into multiple views. Ok.

I created a view that orders by date, and then a view that just uses that view to group by and order by machines – the results however, are not the same. It seems to have taken the date ordering and thrown it out the window.

Any and all help will be appreciated, thanks.

Answer 1

This ended up being the solution, after hours of trying, apparently you can use a subquery on a WHERE but not FROM?

CREATE VIEW something AS

SELECT * FROM Transactions AS t
WHERE Date =
(
  SELECT MAX(Date)
  FROM Transactions
  WHERE Machine = t.Machine
)