This part is about extending the server functionality with user-defined functions, data types, triggers, etc. These are advanced topics which should be approached only after all the other user documentation about PostgreSQL™ has been understood. Later chapters in this part describe the server-side programming languages available in the PostgreSQL™ distribution as well as general issues concerning server-side programming. It is essential to read at least the earlier sections of Chapter 36 (covering functions) before diving into the material about server-side programming.
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