How to check empty or null in Mysql Query?

By Hardik Savani | January 31, 2016 | | 916 Viewer | Category : PHP MySql


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If you want to check empty or null value with conditional statement like case when and if in table row with Mysql database. you like to check empty or null value form table then you have multiple way check that. first we check empty value with case when statement then following example.

Empty Check:

SELECT

(CASE WHEN COALESCE(email,'')!='' THEN email ELSE 'example@gmail.com' END) as test

FROM `customers`

---------------------OR----------------------

SELECT

(CASE COALESCE(email,'') WHEN '' THEN 'example@gmail.com' ELSE email END) as test

FROM `customers`

---------------------OR----------------------

SELECT

(IF(COALESCE(email,'')!='',email,'example@gmail.com')) as exp

FROM `customers`

Null Check:

SELECT

(CASE WHEN email IS NULL THEN 'example@gmail.com' ELSE email END) as test

FROM `customers`

---------------------OR----------------------

SELECT

(IF(email IS NULL,'example@gmail.com',email)) as exp

FROM `customers`