如何在其中具有OUT参数的select语句中调用函数？

Question

If i have a function with OUT parameters then how can we call that function in select statement.
my function is as below

CREATE OR REPLACE FUNCTION fun_1 (p_in IN VARCHAR2, p_out OUT NUMBER)
RETURN number
AS
BEGIN
SELECT SAL INTO p_out FROM emp WHERE ename=P_in;
RETURN p_out;
END;

i want to call that function through select statement as below.

select fun_1('KING', lv_var) from dual;

is it possible. ?

Answer 1

Is this possible? NO

Because, with normal variable,it will give complile time error saying -

"LV_VAR": invalid identifier

Then I tried that using bind variables (:lv_var) . It gave run time error(after setting the bind variable). The reason is -

PL/SQL functions referenced by SQL statements must not contain the OUT parameter.

ORA-06572: Function FUN_1 has out arguments
06572. 00000 -  "Function %s has out arguments"
*Cause:    A SQL statement references either a packaged, or a stand-alone,
           PL/SQL function that contains an OUT parameter in its argument
           list. PL/SQL functions referenced by SQL statements must not
           contain the OUT parameter.
*Action:   Recreate the PL/SQL function without the OUT parameter in the
           argument list.

Hope this helps.