How can I create a blank/hardcoded column in a sql query?

Question

I want have a query with a column that is a hardcoded value not from a table, can this be done? I need it basically as a placeholder that I am going to come back to later a

Answer 1

SELECT
    hat,
    shoe,
    boat,
    0 as placeholder -- for column having 0 value    
FROM
    objects


--OR '' as Placeholder -- for blank column    
--OR NULL as Placeholder -- for column having null value