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Last week I was joyfully hacking away at a project, progressing from from one task to another. Then it came time to do a non-trivial SQL query, though at the time I still thought the query would be nothing more than a select with a GROUP BY. I was wrong.

The Problem

What I wanted was to return the most recent log for each task for a particular user.

Here’s my table:
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Most PHP programmers would have come across this old chestnut before:
Cannot modify header information – headers already sent by page.php line 42

This can happen when you try doing a HTTP redirect or send HTTP 404, as it can happen whenever you try to send headers once they’ve already been sent. When a user sees this, they are basically left high and dry, often on a blank page. The solution is simple:
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