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SQL>
SQL> CREATE TABLE product (
2 product_name VARCHAR2(25) PRIMARY KEY,
3 product_price NUMBER(4,2),
4 quantity_on_hand NUMBER(5,0),
5 last_stock_date DATE
6 );
Table created.
SQL>
SQL> INSERT INTO product VALUES ('Product 1', 99, 1, '15-JAN-03');
1 row created.
SQL> INSERT INTO product VALUES ('Product 2', 75, 1000, '15-JAN-02');
1 row created.
SQL> INSERT INTO product VALUES ('Product 3', 50, 100, '15-JAN-03');
1 row created.
SQL> INSERT INTO product VALUES ('Product 4', 25, 10000, null);
1 row created.
SQL> INSERT INTO product VALUES ('Product 5', 9.95,1234, '15-JAN-04');
1 row created.
SQL> INSERT INTO product VALUES ('Product 6', 45, 1, TO_DATE('December 31, 2008, 11:30 P.M.','Month dd, YYYY, HH:MI P.M.'));
1 row created.
SQL>
SQL>
SQL> DESC product;
Name Null? Type
----------------------------------------------------- -------- ------------------------------------
PRODUCT_NAME NOT NULL VARCHAR2(25)
PRODUCT_PRICE NUMBER(4,2)
QUANTITY_ON_HAND NUMBER(5)
LAST_STOCK_DATE DATE
SQL>
SQL> ALTER TABLE product ADD data_load_date VARCHAR2(8) NULL;
Table altered.
SQL>
SQL>
SQL> ALTER TABLE product MODIFY data_load_date DATE;
Table altered.
SQL>
SQL> DESC product;
Name Null? Type
----------------------------------------------------- -------- ------------------------------------
PRODUCT_NAME NOT NULL VARCHAR2(25)
PRODUCT_PRICE NUMBER(4,2)
QUANTITY_ON_HAND NUMBER(5)
LAST_STOCK_DATE DATE
DATA_LOAD_DATE DATE
SQL>
SQL>
SQL> UPDATE product SET data_load_date = '15-DEC-2003';
6 rows updated.
SQL>
SQL> DESC product;
Name Null? Type
----------------------------------------------------- -------- ------------------------------------
PRODUCT_NAME NOT NULL VARCHAR2(25)
PRODUCT_PRICE NUMBER(4,2)
QUANTITY_ON_HAND NUMBER(5)
LAST_STOCK_DATE DATE
DATA_LOAD_DATE DATE
SQL>
SQL> ALTER TABLE product MODIFY data_load_date NOT NULL;
Table altered.
SQL>
SQL> DESC product;
Name Null? Type
----------------------------------------------------- -------- ------------------------------------
PRODUCT_NAME NOT NULL VARCHAR2(25)
PRODUCT_PRICE NUMBER(4,2)
QUANTITY_ON_HAND NUMBER(5)
LAST_STOCK_DATE DATE
DATA_LOAD_DATE NOT NULL DATE
SQL>
SQL>
SQL>
SQL> drop table product;
Table dropped.
SQL>
SQL>
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