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?
Try this :
select if(Id is null, 0, id) as Id;
The documentation is your friend; you should read it!
expr1; otherwise it returns
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
: 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
SELECT IF(`id` IS NULL, 0, `id`) FROM `table`
There are two ways that you can implement the same logic as a ternary operator:
- Use the
IF(expression, true result, false result)
CASE WHEN expression THEN <true result> ELSE <false_result> END
When you are checking for NULL then you can use the
COALESCE functions, eg.
IFNULL(ID, 0) COALESCE(ID, 0)