TABLE TYPE (array like data structure)

PROCEDURE x_burner
    IS
   
        TYPE VARCHAR2_TABLE IS TABLE OF VARCHAR2(20)
            INDEX BY PLS_INTEGER;
           
        l_test_table VARCHAR2_TABLE;
   
    BEGIN
   
        l_test_table(-10) := 'test value';
       
        DBMS_OUTPUT.PUT_LINE(l_test_table(-10));   
       
        NULL;
           
        EXCEPTION
            WHEN OTHERS THEN
                DBMS_OUTPUT.PUT_LINE(SQLERRM);
                NULL;
    END x_burner;

You could imagine TABLE TYPE as a generic array .. actually  not an array because it's not static; more of an arraylist I guess. And yeah, as you can see in the example, I can set a negative index.

when you try to access an index with no element, ORA-01403: no data found exception is thrown.

(TODO: expound on INDEX BY option)