Wrap delete statements in tmp table select

[mischabraam]

MySQL won't allow a deletion of records when selecting the same table. This will give the "You can't specify target table for update in FROM clause" error. By wrapping the select statement within an alias wou can make mysql create a temp table. See also https://stackoverflow.com/a/18389545

[thomas-kl1]

Hello @mischabraam

Thank you for the fix! much appreciated :)