mysql select query return 0 if null code example

Example 1: mysql return 0 if null

SELECT IFNULL(field, 0) AS field FROM products WHERE id = 1

SELECT IFNULL(SUM(field), 0) as field FROM products

Example 2: mysql select if zero

SELECT IF((SELECT CASE WHEN 1>0 THEN 'true' ELSE 'false' END),'true','false');