Left outer join with using clause : Left Join « Join « SQL / MySQL






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  3. Left Join

Left outer join with using clause

     
mysql>
mysql> CREATE   TABLE PENALTIES
    ->         (PAYMENTNO      INTEGER      NOT NULL,
    ->          EmployeeNO       INTEGER      NOT NULL,
    ->          PAYMENT_DATE   DATE         NOT NULL,
    ->          AMOUNT         DECIMAL(7,2) NOT NULL,
    ->          PRIMARY KEY    (PAYMENTNO)          );
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> INSERT INTO PENALTIES VALUES (1,  6, '1980-12-08',100);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PENALTIES VALUES (2, 44, '1981-05-05', 75);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PENALTIES VALUES (3, 27, '1983-09-10',100);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PENALTIES VALUES (4,104, '1984-12-08', 50);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PENALTIES VALUES (5, 44, '1980-12-08', 25);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PENALTIES VALUES (6,  8, '1980-12-08', 25);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PENALTIES VALUES (7, 44, '1982-12-30', 30);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PENALTIES VALUES (8, 27, '1984-11-12', 75);
Query OK, 1 row affected (0.00 sec)

mysql>
mysql>
mysql> CREATE   TABLE TEAMS
    ->         (TEAMNO           INTEGER      NOT NULL,
    ->          EmployeeNO       INTEGER      NOT NULL,
    ->          DIVISION         CHAR(6)      NOT NULL,
    ->          PRIMARY KEY      (TEAMNO)             );
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql>
mysql> INSERT INTO TEAMS VALUES (1,  6, 'first');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO TEAMS VALUES (2, 27, 'second');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql>
mysql> SELECT   *
    -> FROM     PENALTIES LEFT OUTER JOIN TEAMS
    ->          USING (EmployeeNO);
+------------+-----------+--------------+--------+--------+----------+
| EmployeeNO | PAYMENTNO | PAYMENT_DATE | AMOUNT | TEAMNO | DIVISION |
+------------+-----------+--------------+--------+--------+----------+
|          6 |         1 | 1980-12-08   | 100.00 |      1 | first    |
|         44 |         2 | 1981-05-05   |  75.00 |   NULL | NULL     |
|         27 |         3 | 1983-09-10   | 100.00 |      2 | second   |
|        104 |         4 | 1984-12-08   |  50.00 |   NULL | NULL     |
|         44 |         5 | 1980-12-08   |  25.00 |   NULL | NULL     |
|          8 |         6 | 1980-12-08   |  25.00 |   NULL | NULL     |
|         44 |         7 | 1982-12-30   |  30.00 |   NULL | NULL     |
|         27 |         8 | 1984-11-12   |  75.00 |      2 | second   |
+------------+-----------+--------------+--------+--------+----------+
8 rows in set (0.00 sec)

mysql>
mysql> drop table PENALTIES;
Query OK, 0 rows affected (0.00 sec)

mysql> drop table teams;
Query OK, 0 rows affected (0.00 sec)








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