Multi-column subquery : Multi column subquery « Query Select « Oracle PL/SQL Tutorial

1. Oracle PL/SQL Tutorial
2. Query Select
3. Multi column subquery

SQL>
SQL> CREATE TABLE product_order (
  2       product_name  VARCHAR2(25),
  3       salesperson   VARCHAR2(3),
  4       order_date DATE,
  5       quantity      NUMBER(4,2)
  6  );

Table created.

SQL>
SQL>
SQL> INSERT INTO product_order VALUES ('Product 1', 'CA', '14-JUL-03', 1);

1 row created.

SQL> INSERT INTO product_order VALUES ('Product 2', 'BB', '14-JUL-03', 75);

1 row created.

SQL> INSERT INTO product_order VALUES ('Product 3', 'GA', '14-JUL-03', 2);

1 row created.

SQL> INSERT INTO product_order VALUES ('Product 4', 'GA', '15-JUL-03', 8);

1 row created.

SQL> INSERT INTO product_order VALUES ('Product 5', 'LB', '15-JUL-03', 20);

1 row created.

SQL> INSERT INTO product_order VALUES ('Product 6', 'CA', '16-JUL-03', 5);

1 row created.

SQL> INSERT INTO product_order VALUES ('Product 7', 'CA', '17-JUL-03', 1);

1 row created.

SQL>
SQL>
SQL>
SQL> SELECT * FROM product_order ORDER BY product_name, order_date;

PRODUCT_NAME              SAL ORDER_DAT   QUANTITY
------------------------- --- --------- ----------
Product 1                 CA  14-JUL-03          1
Product 2                 BB  14-JUL-03         75
Product 3                 GA  14-JUL-03          2
Product 4                 GA  15-JUL-03          8
Product 5                 LB  15-JUL-03         20
Product 6                 CA  16-JUL-03          5
Product 7                 CA  17-JUL-03          1

7 rows selected.

SQL>
SQL> SELECT * FROM   product_order
  2  WHERE  (product_name, order_date)
  3  IN     (SELECT product_name, MAX(order_date) FROM product_order GROUP BY product_name);

PRODUCT_NAME              SAL ORDER_DAT   QUANTITY
------------------------- --- --------- ----------
Product 1                 CA  14-JUL-03          1
Product 2                 BB  14-JUL-03         75
Product 3                 GA  14-JUL-03          2
Product 4                 GA  15-JUL-03          8
Product 5                 LB  15-JUL-03         20
Product 6                 CA  16-JUL-03          5
Product 7                 CA  17-JUL-03          1

7 rows selected.

SQL>
SQL> drop table product_order;

Table dropped.

SQL>
SQL>