Implementing Logic

Question

Implementing Logic
I have the following table:
CREATE TABLE my_logic
COL_1 VARCHAR2(100)
INSERT INTO my_logic VALUES ('10 * 20');
INSERT INTO my_logic VALUES ('10 + 20');
INSERT INTO my_logic VALUES ('(10 + 20)/(5-2)');
INSERT INTO my_logic VALUES ('10 + 20/2');
INSERT INTO my_logic VALUES ('10 - 20 + 10');
SELECT * from my_logic;
COL_1
10 * 20
10 + 20
(10 + 20)/(5-2)
10 + 20/2
10 - 20 + 10
Required Output:
OP
200
30
10
20
0
I want each expressions to be evaluated.
No PL/SQL or USER-Defined Functions. I need output with SQL and Built-in Functions.
Imagine that the data is already stored in '10 * 20' format and not just as 10 * 20. Now I want SQL to evaluate the data stored in the column

Answer 1

SQL> SET     FEEDBACK  OFF
SQL> SET     PAGESIZE  0
SQL> SPOOL   foo.sql
SQL> SELECT  'SELECT '
  2  ,       col_1
  3  ,       ' FROM dual;'
  4  FROM    my_logic;
SELECT                           10 * 20
FROM dual;
SELECT                           10 + 20
FROM dual;
SELECT                           (10 + 20)/(5-2)
FROM dual;
SELECT                           10 + 20/2
FROM dual;
SELECT                           10 - 20 + 10
FROM dual;
SQL> SPOOL   OFF
SQL> @foo.sql
SQL> SQL> SELECT  'SELECT '
SP2-0734: commande inconnue au début de "SQL> SELEC..." - le reste de la ligne est ignoré.
SQL>   2  ,       col_1
SQL>   3  ,       ' FROM dual;'
SQL>   4  FROM    my_logic;
SQL> SELECT                           10 * 20
  2   FROM dual;
       200
SQL>
SQL> SELECT                           10 + 20
  2   FROM dual;
        30
SQL>
SQL> SELECT                           (10 + 20)/(5-2)
  2   FROM dual;
           10
SQL>
SQL> SELECT                           10 + 20/2
  2   FROM dual;
        20
SQL>
SQL> SELECT                           10 - 20 + 10
  2   FROM dual;
         0
SQL>
SQL> SQL> SPOOL   OFF
SP2-0734: commande inconnue au début de "SQL> SPOOL..." - le reste de la ligne est ignoré.
SQL>
SQL>