Use case else to check the exceptions : CASE « Function « SQL / MySQL






  1. SQL / MySQL
  2. Function
  3. CASE

Use case else to check the exceptions

      
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, AMOUNT
    -> FROM     PENALTIES
    -> WHERE    CASE
    ->             WHEN AMOUNT >= 0 AND AMOUNT <= 40
    ->                THEN 'low'
    ->             WHEN AMOUNT > 40 AND AMOUNT <= 80
    ->                THEN 'moderate'
    ->             WHEN AMOUNT > 80
    ->                THEN 'high'
    ->             ELSE 'incorrect' END = 'low';
+-----------+--------+
| PAYMENTNO | AMOUNT |
+-----------+--------+
|         5 |  25.00 |
|         6 |  25.00 |
|         7 |  30.00 |
+-----------+--------+
3 rows in set (0.00 sec)

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








Related examples in the same category

1.CASE() Function
2.The next version of the CASE() function
3.CASE Branching
4.CASE is a variant of IF that is useful when all the branch decisions depend on the value of a single expression.
5.Using case in select statement
6.Use both case expressions shown previously in a SELECT statement.
7.Using the comparison value form of CASE...WHEN
8.Using CASE...WHEN for evaluating conditions
9.Variants of CASE.WHEN with no ELSE clause
10.Use a CASE...WHEN function to indicate that the different categories have different sales trends
11.Case without else clause
12.Nested case statement
13.Case with comparison
14.Case when with and operator
15.Provide more meaningful value with case clause
16.Make more complete value with case statement
17.Using case statement to check a range
18.Using case with comparison
19.Case clause and aggregate function
20.If ELSE is omitted, the null value is returned.