PLS-00231 function name may not be used in SQL

在存储过程或函数的声明部分，定义一个局部函数，结果在select中使用时报PLS-00231错误。

PLS-00231: function ‘string’ may not be used in SQL

Cause: A proscribed function was used in a SQL statement. Certain functions such as SQLCODE and SQLERRM can be used only in procedural statements.

Action: Remove the function call from the SQL statement. Or, replace the function call with a local variable. For example, the following statement is illegal: INSERT INTO errors VALUES (SQLCODE, SQLERRM); However, you can assign the values of SQLCODE and SQLERRM to local variables, then use the variables in the SQL statement, as follows: err_num := SQLCODE; err_msg := SQLERRM; INSERT INTO errors VALUES (err_num, err_msg);

根据不同的场景选择相应的处理办法：

1.改成赋值操作，aa:=f()

2.把主程序改成包，将函数定义在包里