Ho to do this? What query can be written by using select statement where

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Editorial Team

Asked: June 1, 20262026-06-01T02:05:15+00:00 2026-06-01T02:05:15+00:00

Ho to do this?
What query can be written by using select statement where all nulls should be replaced with 123?

I know we can do this y using,
update tablename set fieldname = “123” where fieldname is null;

but can’t do it using select statement.

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Editorial Team · Answer 1 · 2026-06-01T02:05:17+00:00

Editorial Team

You have a lot of options for substituting NULL values in MySQL:

select case 
    when fieldname is null then '123' 
    else fieldname end as fieldname 
from tablename

select coalesce(fieldname, '123') as fieldname 
from tablename

select ifnull(fieldname, '123') as fieldname 
from tablename

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