How to implement ternary conditional operator in MySQL

Question

I want to implement ternary conditional operator in MySQL. I have a table in which one field id exist. Its value may be null. I want to display id in ternary conditional format like this:

select id = id == null ? 0 : id; 

Is it possible in MySQL?

Answer 1

Try this :

select if(Id is null, 0, id) as Id; 

Answer 2

The documentation is your friend; you should read it!

It says:

IFNULL(expr1,expr2) 

If expr1 is not NULL, IFNULL() returns expr1; otherwise it returns expr2.

And then lots of examples. This is equivalent to using a ternary conditional with a comparison to NULL and the comparison subject as the second operand; that it doesn't happen to use the symbols ? and : to get you there is not really relevant to anything.

So, in your case:

SELECT IFNULL(`id`, 0) FROM `table` 

If you're desperate to provide three operands explicitly (why?!), then switch to IF:

SELECT IF(`id` IS NULL, 0, `id`) FROM `table`