Mega Code Archive
Calculation in subquery
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mysql>
mysql> CREATE TABLE MATCHES
-> (MATCHNO INTEGER NOT NULL,
-> TEAMNO INTEGER NOT NULL,
-> EmployeeNO INTEGER NOT NULL,
-> WON SMALLINT NOT NULL,
-> LOST SMALLINT NOT NULL,
-> PRIMARY KEY (MATCHNO) );
Query OK, 0 rows affected (0.01 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 ( 2, 1, 6, 2, 3);
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO MATCHES VALUES ( 3, 1, 6, 3, 0);
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> INSERT INTO MATCHES VALUES ( 5, 1, 83, 0, 3);
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO MATCHES VALUES ( 6, 1, 2, 1, 3);
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO MATCHES VALUES ( 7, 1, 57, 3, 0);
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO MATCHES VALUES ( 8, 1, 8, 0, 3);
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO MATCHES VALUES ( 9, 2, 27, 3, 2);
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO MATCHES VALUES (10, 2, 104, 3, 2);
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO MATCHES VALUES (11, 2, 112, 2, 3);
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO MATCHES VALUES (12, 2, 112, 1, 3);
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO MATCHES VALUES (13, 2, 8, 0, 3);
Query OK, 1 row affected (0.00 sec)
mysql>
mysql>
mysql> SELECT MATCHNO, DIFFERENCE
-> FROM (SELECT MATCHNO,
-> ABS(WON - LOST) AS DIFFERENCE
-> FROM MATCHES) AS M
-> WHERE DIFFERENCE > 2;
+---------+------------+
| MATCHNO | DIFFERENCE |
+---------+------------+
| 3 | 3 |
| 5 | 3 |
| 7 | 3 |
| 8 | 3 |
| 13 | 3 |
+---------+------------+
5 rows in set (0.00 sec)
mysql>
mysql> drop table matches;
Query OK, 0 rows affected (0.00 sec)
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