http://redotheweb.com/2008/07/08/comparing-propel-doctrine-and-sfpropelfinder/
Good (but old) article why not to use stored procedures in combination with PHP applications.
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Saved me a lot of time:
SELECT COUNT(*), column1, column2 FROM tablename
GROUP BY column1, column2
HAVING COUNT(*)>1;
Source: http://lists.mysql.com/mysql/204859
Apr
21
Need to know for all developers…
Get a basic idea of how sql injections work: http://ferruh.mavituna.com/sql-injection-cheatsheet-oku