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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