CGridView filtering with aggregate (grouping) functions - eg MAX()?

You're on the right track. You filter aggregate functions like MAX() and SUM() using having . In a query like this, you should probably add a group otherwise you'll end up with a lot of duplicated data in your result when a Distributor has multiple notes on the same day (assuming t.id is a primary key).

Second, you should use named params instead of putting variables directly into SQL. So, instead of compare('last_note'... you'd end up with something like this.

In order for filtering to work, you should have a class attribute to store the data.

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