I am formalating a query to give the number of reports submitted over the last year ordered by date. I get the current year and month with php:
x
$year = date('Y') - 1;
$month = date('m');
and execute the following query: SQL:
SELECT month(date_lm) AS `month` ,
count(*) AS `count`
FROM `reports`
WHERE (status = 'submitted')
AND (date_lm > 2012-08)
GROUP BY month(date_lm)
ORDER BY month(date_lm) ASC
And because there has only been 1 submitted in the last year it gives me only 1 result…
| month | count |
| 7 | 1 |
But I would like the result set to show:
| month | count |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | 0 |
Is that possible?
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Answer
You should LEFT JOIN this table with 1..12 table. Something like this:
SELECT Months.id AS `month` ,
COUNT(`reports`.date_lm) AS `count`
FROM
(
SELECT 1 as ID UNION SELECT 2 as ID UNION SELECT 3 as ID UNION SELECT 4 as ID
UNION
SELECT 5 as ID UNION SELECT 6 as ID UNION SELECT 7 as ID UNION SELECT 8 as ID
UNION
SELECT 9 as ID UNION SELECT 10 as ID UNION SELECT 11 as ID UNION SELECT 12 as ID
) as Months
LEFT JOIN `reports` on Months.id=month(`reports`.date_lm)
AND
(status = 'submitted')
AND (date_lm > 2012-08)
GROUP BY Months.id
ORDER BY Months.id ASC