MySQL monthly Sale of last 12 months including months with no Sale - mysql

Question

SELECT DATE_FORMAT(date, "%b") AS month, SUM(total_price) as total
FROM cart
WHERE date <= NOW()
and date >= Date_add(Now(),interval - 12 month)
GROUP BY DATE_FORMAT(date, "%m-%Y")
This query displaying result for only existing month. I need all 12 months sales.
Output:
"month" "total"
--------------
"Jun" "22"
"Aug" "30"
"Oct" "19"
"Nov" "123"
"Dec" "410"
Required Output:
"month" "total"
--------------
"Jan" "0"
"Feb" "0"
"Mar" "0"
"Apr" "0"
"May" "0"
"Jun" "22"
"Jul" "0"
"Aug" "30"
"Sep" "0"
"Oct" "19"
"Nov" "123"
"Dec" "410"

Answer 1

Consider the following table
mysql> select * from cart ;
+------+------------+-------------+
| id | date | total_price |
+------+------------+-------------+
| 1 | 2014-01-01 | 10 |
| 2 | 2014-01-20 | 20 |
| 3 | 2014-02-03 | 30 |
| 4 | 2014-02-28 | 40 |
| 5 | 2014-06-01 | 50 |
| 6 | 2014-06-13 | 24 |
| 7 | 2014-12-12 | 45 |
| 8 | 2014-12-18 | 10 |
+------+------------+-------------+
Now as per the logic you are looking back one year and december will appear twice in the result i.e. dec 2013 and dec 2014 and if we need to have a separate count for them then we can use the following technique of generating dynamic date range MySql Single Table, Select last 7 days and include empty rows
t1.month,
t1.md,
coalesce(SUM(t1.amount+t2.amount), 0) AS total
from
(
select DATE_FORMAT(a.Date,"%b") as month,
DATE_FORMAT(a.Date, "%m-%Y") as md,
'0' as amount
from (
select curdate() - INTERVAL (a.a + (10 * b.a) + (100 * c.a)) DAY as Date
from (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as a
cross join (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as b
cross join (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as c
) a
where a.Date <= NOW() and a.Date >= Date_add(Now(),interval - 12 month)
group by md
)t1
left join
(
SELECT DATE_FORMAT(date, "%b") AS month, SUM(total_price) as amount ,DATE_FORMAT(date, "%m-%Y") as md
FROM cart
where Date <= NOW() and Date >= Date_add(Now(),interval - 12 month)
GROUP BY md
)t2
on t2.md = t1.md
group by t1.md
order by t1.md
;
Output will be
+-------+---------+-------+
| month | md | total |
+-------+---------+-------+
| Jan | 01-2014 | 30 |
| Feb | 02-2014 | 70 |
| Mar | 03-2014 | 0 |
| Apr | 04-2014 | 0 |
| May | 05-2014 | 0 |
| Jun | 06-2014 | 74 |
| Jul | 07-2014 | 0 |
| Aug | 08-2014 | 0 |
| Sep | 09-2014 | 0 |
| Oct | 10-2014 | 0 |
| Nov | 11-2014 | 0 |
| Dec | 12-2013 | 0 |
| Dec | 12-2014 | 55 |
+-------+---------+-------+
13 rows in set (0.00 sec)
And if you do not care about the above case i.e. dec 2014 and dec 2013
Then just change the group by in dynamic date part as
where a.Date <= NOW() and a.Date >= Date_add(Now(),interval - 12 month)
group by month
and final group by as group by t1.month

Answer 2

Thanks for #pankaj hint, Here i resolved it via this query...
SELECT
SUM(IF(month = 'Jan', total, 0)) AS 'Jan',
SUM(IF(month = 'Feb', total, 0)) AS 'Feb',
SUM(IF(month = 'Mar', total, 0)) AS 'Mar',
SUM(IF(month = 'Apr', total, 0)) AS 'Apr',
SUM(IF(month = 'May', total, 0)) AS 'May',
SUM(IF(month = 'Jun', total, 0)) AS 'Jun',
SUM(IF(month = 'Jul', total, 0)) AS 'Jul',
SUM(IF(month = 'Aug', total, 0)) AS 'Aug',
SUM(IF(month = 'Sep', total, 0)) AS 'Sep',
SUM(IF(month = 'Oct', total, 0)) AS 'Oct',
SUM(IF(month = 'Nov', total, 0)) AS 'Nov',
SUM(IF(month = 'Dec', total, 0)) AS 'Dec',
SUM(total) AS total_yearly
FROM (
SELECT DATE_FORMAT(date, "%b") AS month, SUM(total_price) as total
FROM cart
WHERE date <= NOW() and date >= Date_add(Now(),interval - 12 month)
GROUP BY DATE_FORMAT(date, "%m-%Y")) as sub

Answer 3

Month wise sale
Use Count to count month wise data.
SELECT DATE_FORMAT(date, "%b") AS month, COUNT(total_price) as total
FROM cart
WHERE date <= NOW()
and date >= Date_add(Now(),interval - 12 month)
GROUP BY DATE_FORMAT(date, "%m-%Y")