I want Age 0 when the date is 0 in mysql query

Question

SELECT (GREATEST((YEAR(NOW()) - GREATEST( M.MANUFACTURING_DATE,1900)), 0))
AS AGE,M.MANUFACTURING_DATE FROM table_name M;

Above is my mysql query where if i consider MANUFACTURING_DATE =0 then it results Age as 117, i want some solution where if the MANUFACTURING_DATE =0 it should result the Age as 0.

Answer 1

You can use a CASE stattement:

SELECT 
    CASE 
        WHEN M.MANUFACTURING_DATE=0 THEN 0
        ELSE (GREATEST((YEAR(NOW()) - GREATEST( M.MANUFACTURING_DATE,1900)), 0))
    END
    AS AGE,M.MANUFACTURING_DATE 
FROM table_name M;