if condition in where clause in mysql code example

Example 1: mysql if statement in where clause

SELECT  `id` ,  `naam` 
FROM  `klanten` 
WHERE IF(`email` != '', `email`, `email2`) LIKE  '%@domain.nl%'

Example 2: in condition in mysql

//Syntax
SELECT * FROM `tableName` WHERE `ColumnName` IN (Value1,Value1,Value1);

//Example:
SELECT * FROM `members` WHERE `membership_number` IN (1,2,3);