SQL>
SQL> CREATE TABLE product (
2 product_name VARCHAR2(25),
3 product_price NUMBER(4,2),
4 quantity_on_hand NUMBER(5,0),
5 last_stock_date DATE);
Table created.
SQL>
SQL> INSERT INTO product VALUES ('Small Widget', 99, 1, '15-JAN-03');
1 row created.
SQL> INSERT INTO product VALUES ('Medium Widget', 75, 1000, '15-JAN-02');
1 row created.
SQL> INSERT INTO product VALUES ('Product Number', 50, 100, '15-JAN-03');
1 row created.
SQL> INSERT INTO product VALUES ('Round Church Station', 25, 10000, null);
1 row created.
SQL>
SQL> SELECT product_name,
2 NVL(last_stock_date, 'N/A') "Last Stocked"
3 FROM product;
NVL(last_stock_date, 'N/A') "Last Stocked"
*
ERROR at line 2:
ORA-01858: a non-numeric character was found where a numeric was expected
SQL>
SQL> DROP TABLE product;
Table dropped.
SQL>