[BiteCode_dev]

This is one of the reason I don't like to put application logic directly in the database.

It makes everything harder: caching, testing, abstracting, balancing, etc.

[Tomis02]

Where do you draw the line between a query and application logic? Does a join or aggregate function count as application logic?

On another note, a few hours/days spent implementing application code can save you 5 minutes of writing SQL.