Get data from first date on database till today - mysql

Question

I want to group my data by date and view it on chart. here my data example:
count created_at
----- ----------
5 2020/04/20
4 2020/04/21
3 2020/04/25
9 2020/04/28
i want my data when i fetch be like
count created_at
----- ----------
5 2020/04/20
4 2020/04/21
0 2020/04/22
0 2020/04/23
0 2020/04/24
3 2020/04/25
0 2020/04/26
0 2020/04/27
9 2020/04/28
when there is no data in that date it will shown 0. can u guys help me how to get it on laravel controller?
thanks before.

Answer 1

#Alun here is an example of how you can do this:
SELECT `dateList`.`Date`,
CASE WHEN `yt`.`date` IS NULL THEN 0
ELSE COUNT(`yt`.`id`)
END AS `amt`
FROM
-- this is the part you can copy/paste
-- to be used to left join in a table of your choice
-- ---------------------------------------------------------------------------------------------------------------------------
(
SELECT DATE(`a`.`Date`) AS `Date`
FROM (
SELECT NOW() - 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`
) AS `a`
WHERE `a`.`Date` BETWEEN '2020-04-01' AND NOW()
) AS `dateList`
-- ---------------------------------------------------------------------------------------------------------------------------
LEFT JOIN `yourTable` AS `yt` ON `dateList`.`Date` = DATE(`yt`.`date`)
GROUP BY `dateList`.`Date`
ORDER BY `dateList`.`Date` ASC
Just sub your table name in place of yourTable in this query (modifying the date column name from your table replacing yt.date accordingly) and this will give you a list for every day of the month showing 0 for any day of the month that doesn't have any value.
As far as getting this to work using eloquent in a Laravel controller it might be possible but off the top of my head I don't know how you would do it. You could use this this raw SQL in the controller to accomplish what you want though.
Here's an example of how it works in sql fiddle.
Hope this helps!