23.3.1. Features of the User-Defined Function Interface

The MySQL interface for user-defined functions provides the following features and capabilities:

  • Functions can return string, integer, or real values and can accept arguments of those same types.

  • You can define simple functions that operate on a single row at a time, or aggregate functions that operate on groups of rows.

  • Information is provided to functions that enables them to check the number, types, and names of the arguments passed to them.

  • You can tell MySQL to coerce arguments to a given type before passing them to a function.

  • You can indicate that a function returns NULL or that an error occurred.

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