SQL>
SQL>
SQL> CREATE TABLE product (
2 product_name VARCHAR2(25),
3 product_price NUMBER(4,2),
4 purchase_date DATE
5 );
Table created.
SQL>
SQL> ALTER TABLE product ADD (
2 CONSTRAINT reasonable_stock_date CHECK(
3 TO_CHAR(purchase_date, 'YYYY-MM-DD') >= '2001-12-31'
4 )
5 );
Table altered.
SQL>
SQL> INSERT INTO product VALUES ('S', 49, '30-DEC-01');
INSERT INTO product VALUES ('S', 49, '30-DEC-01')
*
ERROR at line 1:
ORA-02290: check constraint (RNTSOFT.REASONABLE_STOCK_DATE) violated
SQL>
SQL> drop table product;
Table dropped.
SQL>
SQL>