Question

I would like to draw a linear chart in my xhtml page. In the abscissa, I want to put the months, and in the ordinate I want to put the quantity of orders per month.
In your opinion, is it possible to create a mysql query to return a list in which each row contains one month and quantity of orders in the second attribute.

here is my table :

and here is the sql query to retrieve all date_envoi :

select date_envoi from commande;

here is the image :

Answer 1

You need to GROUP records by MONTH and YEAR:

SELECT DATE_FORMAT(date_envoi, '%M %Y') AS month,
       COUNT(*) AS order_quantity
FROM commande
GROUP BY YEAR(date_envoi), MONTH(date_envoi);

EDIT: To get month in numeric format:

SELECT YEAR(date_envoi) AS year,
       MONTH(date_envoi) AS month,
       COUNT(*) AS order_quantity
FROM commande
GROUP BY YEAR(date_envoi), MONTH(date_envoi);

EDIT 2:

SELECT `month`, SUM(order_quantity) AS order_quantity
FROM(

    SELECT MONTH(date_envoi) AS month,
           COUNT(*) AS order_quantity
    FROM commande
    GROUP BY MONTH(date_envoi)
    UNION ALL
    SELECT 1 AS month, 0 order_quantity
    UNION ALL
    SELECT 2 AS month, 0 order_quantity
    UNION ALL
    SELECT 3 AS month, 0 order_quantity
    UNION ALL
    SELECT 4 AS month, 0 order_quantity
    UNION ALL
    SELECT 5 AS month, 0 order_quantity
    UNION ALL
    SELECT 6 AS month, 0 order_quantity
    UNION ALL
    SELECT 7 AS month, 0 order_quantity
    UNION ALL
    SELECT 8 AS month, 0 order_quantity
    UNION ALL
    SELECT 9 AS month, 0 order_quantity
    UNION ALL
    SELECT 10 AS month, 0 order_quantity
    UNION ALL
    SELECT 11 AS month, 0 order_quantity
    UNION ALL
    SELECT 12 AS month, 0 order_quantity
) a
GROUP BY `month`
ORDER BY `month` ASC;