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MySQL Case In Where Clause
Posted on: January 20, 2009 at 12:00 AM

MySQL Case: If you want to implement a complex conditional construction then you can use MySQL case statement. It performs the work as programming type.

MySQL Case In Where Clause

This example illustrates how to use case statement where clause in MySQL database.

MySQL Case: If you want to implement a complex conditional construction then you can use MySQL case statement. It performs the work as programming type. The CASE statement is used with two other keywords "WHEN" and "THEN". If the column data is matched with the "WHEN" data then it takes the corresponding "THEN" data. If no data is matched then the "ELSE" data is taken.

Table: employeeDetails

CREATE TABLE `employeedetails` (
`id` int(11) NOT NULL auto_increment,
`empName` varchar(100) NOT NULL,
`daysName` varchar(50) NOT NULL,
PRIMARY KEY (`id`)
)

Query to select all data:

SELECT * FROM employeedetails;

Output:

Using MySQL 'case' and 'where' clause:

SELECT daysName, CASE daysName
WHEN "Sunday" THEN "Holiday"
WHEN "Monday" THEN "Working Day"
WHEN "Tuesday" THEN "Working Day"
WHEN "Wednesday" THEN "Working Day"
WHEN "Thrusday" THEN "Working Day"
WHEN "Friday" THEN "Working Day"
WHEN "Saturday" THEN "Holiday"
ELSE "Illegal Argument"
END AS "Status"
FROM employeeDetails
WHERE daysName='Sunday'
OR daysName='Monday' OR daysName='Tuesday'
OR daysName='Wednesday' OR daysName='Thrusday'
OR daysName='Friday' OR daysName='Saturday';

The query above will exclude the row having value "January" in the daysName column from the result.

Output:

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