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COALESCE() method in Mysql with Example in Methods of MySQL
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COALESCE() 
COALESCE() Method taking list of values.

Returns not null value at first occurance of the list, otherwise null when all list values are null.
Example
-- returns one
SELECT COALESCE("one","two","three");

-- returns two
SELECT COALESCE(null,"two","three");

-- returns one
SELECT COALESCE("one",null,"three");

-- returns three
SELECT COALESCE(null,null,"three");

-- returns null
SELECT COALESCE(null,null,null);
Output 
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