Provide more meaningful value with case 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> SELECT   PAYMENTNO, PAYMENTNO > 4
    -> FROM     PENALTIES;
+-----------+---------------+
| PAYMENTNO | PAYMENTNO > 4 |
+-----------+---------------+
|         1 |             0 |
|         2 |             0 |
|         3 |             0 |
|         4 |             0 |
|         5 |             1 |
|         6 |             1 |
|         7 |             1 |
|         8 |             1 |
+-----------+---------------+
8 rows in set (0.00 sec)

mysql>
mysql>
mysql> SELECT   PAYMENTNO, CASE PAYMENTNO > 4
    ->                          WHEN 1 THEN 'Greater than 4'
    ->                          ELSE 'Less than 5'
    ->                       END AS GREATER_LESS
    -> FROM     PENALTIES;
+-----------+----------------+
| PAYMENTNO | GREATER_LESS   |
+-----------+----------------+
|         1 | Less than 5    |
|         2 | Less than 5    |
|         3 | Less than 5    |
|         4 | Less than 5    |
|         5 | Greater than 4 |
|         6 | Greater than 4 |
|         7 | Greater than 4 |
|         8 | Greater than 4 |
+-----------+----------------+
8 rows in set (0.00 sec)

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

mysql>

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Provide more meaningful value with case clause : CASE « Function « SQL / MySQL

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