|PostgreSQL 7.4.7 Documentation|
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This part is about extending the server functionality with user-defined functions, data types, triggers, etc. These are advanced topics which should probably be approached only after all the other user documentation about PostgreSQL has been understood. This part also describes the server-side programming languages available in the PostgreSQL distribution as well as general issues concerning server-side programming languages. This information is only useful to readers that have read at least the first few chapters of this part.