How do I group the results of a mysql query?

If you want to group the results by a particular field value rather than listing all results individually, then you use the GROUP BY keyword.

Here is how the query might look:

SELECT columns FROM Table WHERE clause GROUP BY column ORDER BY column

Common mistakes are to apply the GROUP BY either before the WHERE clause or after the ORDER BY - make sure you get it right.

Also remember that you are returning aggregate data rather than every result as an individual row, therefore it can take a little bit of careful thinking as to when you should use GROUP BY and a realisation of what will be returned when you do.

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