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.
|CREATE TABLE `employeedetails` (
`id` int(11) NOT NULL auto_increment,
`empName` varchar(100) NOT NULL,
`daysName` varchar(50) NOT NULL,
PRIMARY KEY (`id`)
|SELECT * FROM employeedetails;|
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"
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.
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