MySql count() to return 0 if no records found

Question

I have a set of posts on monthly basis. Now i need an array which contains total records of posts posted in each month. I tried below MySql query, Its working fine, but I wa

Answer 1

There is no record for the month of January that is why you are getting no result. One solution that works is by joining a subquery with contains list of months that you want to be shown on the list.

SELECT count(b.id) as totalRec
FROM   (
            SELECT 'January' mnth
            UNION ALL
            SELECT 'February' mnth
            UNION ALL
            SELECT 'March' mnth
        ) a
        LEFT JOIN post b
            ON a.mnth = DATE_FORMAT(b.date, '%M') AND
               year(b.date) =  '2013' AND 
               DATE_FORMAT(b.date, '%M') IN ('January', 'February', 'March') 
GROUP  BY year(b.date)-month(b.date) 
ORDER  BY b.date ASC

• SQLFiddle Demo

OUTPUT

╔══════════╗
║ TOTALREC ║
╠══════════╣
║        0 ║
║        7 ║
║        9 ║
╚══════════╝