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In 12c, you can use SQL to run PL/SQL functions or procedures faster, which are defined and declared by the WITH statement of the SQL statement.

How to define and declare a procedure or function in a WITH statement:

WITH PROCEDURE | FUNCTION test1 (…) BEGINEND

SELECT FROM table_name;/

Although you cannot use the WITH statement directly in the PL/SQL unit, it can be referenced by a dynamic SQL in the PL/SQL unit.

SQL > set serveroutput on

SQL > with function Is_Number

2 (x in varchar2) return varchar2 is

3 Plsql_Num_Error exception

4 pragma exception_init (Plsql_Num_Error,-06502)

5 begin

6 if (To_Number (x) is NOT null) then

7 return'Y'

8 else

9 return''

10 end if

11 exception

12 when Plsql_Num_Error then

13 return'N'

14 end Is_Number

15 select Is_Number ('test') is_num from dual

16 /

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