ZF2-424: Sql query builder doesn't support distinct


The Sql object query builder doesn't support the distinct keyword, which was available in ZF1.


It does indeed, you can pass an expression as a column name ($select is an instance of Zend\Db\Sql\Select)

    'aid' => new Zend\Db\Sql\Expression('DISTINCT artist_id')

If you have to ensure that the column is properly quoted for future abstraction purposes:

    'aid' => new Zend\Db\Sql\Expression(
       'DISTINCT ?',

This doesn't feel very obvious and causes an error if the distinct expression doesn't come first (certainly using MySQL). How can I take a base select query and later in another method add a join and make it return distinct rows? In my specific case I have a base query that selects orders, I might modify this with a join against the order items when I want to only select orders that have a certain item. In ZF1 you would simply do the join and call the distinct method.

You make an excellent point. I'll work on this soon.

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