Question

I have a query like this:

SELECT SUM(spend.price) AS total, WEEKDAY(spend.date) AS weekday
FROM spend
WHERE spend.date BETWEEN '2012-11-01' AND '2012-11-07'
GROUP BY WEEKDAY(spend.date) ;

Right now the query gives me only the days in which the user had some payments.

total weekday
60    2
10    3
3     5
3     6

But instead I want to give me 0 (zeros) for every day without payments.

total weekday
0     1
60    2
10    3
0     4
3     5
3     6
0     7

Table schema here.

Answer 1

Here is the original syntax:

SELECT SUM(spend.price) AS total, day AS weekday
FROM (SELECT price, WEEKDAY(date) as day FROM spend WHERE date BETWEEN '2012-11-01' AND '2012-11-07'
UNION ALL
SELECT 0,0
UNION ALL
SELECT 0,1
UNION ALL
SELECT 0,2
UNION ALL
SELECT 0,3
UNION ALL
SELECT 0,4
UNION ALL
SELECT 0,5
UNION ALL
SELECT 0,6
) spend
GROUP BY day ;

And here is the shortened one:

CREATE TEMPORARY TABLE tmp ( `price` int, `day` int );
INSERT INTO tmp VALUES (0,0),(0,1),(0,2),(0,3),(0,4),(0,5),(0,6);
SELECT SUM(spend.price) AS total, day AS weekday
FROM (SELECT price, WEEKDAY(date) as day FROM spend WHERE date BETWEEN '2012-11-01' AND '2012-11-07'
UNION ALL
SELECT * FROM tmp
) spend
GROUP BY day ;

Here is a demonstration: http://sqlfiddle.com/#!2/8c323/3/0