Ruby on Rails

On Jul 23, 2013, at 6:28 PM, Yaw Boakye elGran <yawboakye10@gmail.com> wrote:

>       • During grouping, the normal SQL requirement is to group on a column that is on both tables. As far as I know, grouping can't be done on two tables when they don't a common column. In your group call, only titles.id would be useful. The rest won't

You seem to be confusing the grouping with the join condition. The join requires 1 (usually, sometimes more) column common to both tables. The grouping must include all columns not used in the aggregate function.


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Scott Ribe
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