|PostgreSQL 8.2.6 Documentation|
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PL/pgSQL is a loadable procedural language for the PostgreSQL database system. The design goals of PL/pgSQL were to create a loadable procedural language that
can be used to create functions and trigger procedures,
adds control structures to the SQL language,
can perform complex computations,
inherits all user-defined types, functions, and operators,
can be defined to be trusted by the server,
is easy to use.
Except for input/output conversion and calculation functions for user-defined types, anything that can be defined in C language functions can also be done with PL/pgSQL. For example, it is possible to create complex conditional computation functions and later use them to define operators or use them in index expressions.