Mysql subquery returns more than 1 row?

I think (part of) the problem is that you are re-using an alias in a wrong location. You should one use an alias once, and don't mix them for different instances of the same table.

Execute each subquery manually in phpmyadmin and see which one is returning more than one row and you have your answer. Another option is to add a limit of 1 to each subquery to make sure only one row is returned. Of course it is better to look for the bug and solve it.

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