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Database Function 
A database function is a database object that contains a series of statements and, therefore, forms an independent part of a program. A database function returns a value as a result.
Database functions are generated and stored in the database. You can define as many database functions as required. To implement a database function, you must use a function call for an SQL statement (database function call).
See also:
Reference Manual
·
CREATE FUNCTION
Statement (create_function_statement)
·
Database Function
(dbfunction_call)