The CREATE FUNCTION statement is used to create stored functions and loadable functions:CREATE FUNCTION语句用于创建存储函数和可加载函数：
For information about creating stored functions, see Section 13.1.17, “CREATE PROCEDURE and CREATE FUNCTION Statements”.有关创建存储函数的信息，请参阅第13.1.17节，“CREATE PROCEDURE语句和CREATE FUNCTION语句”。
For information about creating loadable functions, see Section 13.7.4.1, “CREATE FUNCTION Statement for Loadable Functions”.有关创建可加载函数的信息，请参阅第13.7.4.1节，“针对可加载函数的CREATE FUNCTION语句”。