SQL>
SQL> create table product(
2 product_id integer
3 ,price number(7,2)
4 ,description varchar2(75)
5 ,onhand number(5,0)
6 ,reorder number(5,0)
7 ,supplier_no integer
8 );
Table created.
SQL> insert into product(product_id, price, description, onhand, reorder)values (1,2.50,'Oracle',100,20);
1 row created.
SQL> insert into product(product_id, price, description, onhand, reorder)values (2,23.00,'SQL Server',null,null);
1 row created.
SQL> insert into product(product_id, price, description, onhand, reorder)values (3,null,'MySQL',null,null);
1 row created.
SQL> insert into product(product_id, price, description, onhand, reorder)values (4,1.50,'DB2',50,10);
1 row created.
SQL> insert into product(product_id, price, description, onhand, reorder)values (5,10.50,'Java',100,20);
1 row created.
SQL> insert into product(product_id, price, description, onhand, reorder)values (6,45.00,'C++',null,null);
1 row created.
SQL> insert into product(product_id, price, description, onhand, reorder)values (7,19.99,'Javascript',3,5);
1 row created.
SQL> insert into product(product_id, price, description, onhand, reorder)values (null,4.50,'Ruby',null,null);
1 row created.
SQL>
SQL> select count(*) - count(product_id) from product;
COUNT(*)-COUNT(PRODUCT_ID)
--------------------------
1
1 row selected.
SQL>
SQL> drop table product;
Table dropped.
SQL> --