Create a view in which the difference between the number of sets won and the number of sets lost are recorded : Create View « View « SQL / MySQL






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Create a view in which the difference between the number of sets won and the number of sets lost are recorded

    
for each match.
mysql>
mysql> CREATE TABLE MATCHES(
    ->     MATCHNO INTEGER NOT NULL,
    ->     TEAMNO INTEGER NOT NULL,
    ->     PLAYERNO INTEGER NOT NULL,
    ->     WON SMALLINT NOT NULL,
    ->     LOST SMALLINT NOT NULL,
    ->     PRIMARY KEY (MATCHNO)
    -> );
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> INSERT INTO MATCHES VALUES (1, 1, 6, 3, 1);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO MATCHES VALUES (4, 1, 44, 3, 2);
Query OK, 1 row affected (0.00 sec)

mysql>
mysql>
mysql>
mysql> CREATE VIEW NUMBER_SETS (MATCHNO, DIFFERENCE) AS
    -> SELECT MATCHNO, ABS(WON - LOST)
    -> FROM MATCHES;
mysql>
mysql>
mysql> SELECT *
    -> FROM NUMBER_SETS;
+---------+------------+
| MATCHNO | DIFFERENCE |
+---------+------------+
|       1 |          2 |
|       4 |          1 |
+---------+------------+
2 rows in set (0.00 sec)

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








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