SQL: count days from table based on month

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SQL: count days from table based on month



Hello everyone,



I have this query on a mysql database:


SELECT DAYNAME(added_time) = 'Monday',
COUNT(CASE WHEN MONTH(added_time) = 1 AND DAYNAME(added_time) = 'Monday' THEN 1 ELSE NULL END) mongen,
COUNT(CASE WHEN MONTH(added_time) = 2 AND DAYNAME(added_time) = 'Monday' THEN 1 ELSE NULL END) monfeb,
COUNT(CASE WHEN MONTH(added_time) = 3 AND DAYNAME(added_time) = 'Monday' THEN 1 ELSE NULL END) monmar,
COUNT(CASE WHEN MONTH(added_time) = 4 AND DAYNAME(added_time) = 'Monday' THEN 1 ELSE NULL END) monapr,
COUNT(CASE WHEN MONTH(added_time) = 5 AND DAYNAME(added_time) = 'Monday' THEN 1 ELSE NULL END) monmag,
COUNT(CASE WHEN MONTH(added_time) = 6 AND DAYNAME(added_time) = 'Monday' THEN 1 ELSE NULL END) mongiu,
COUNT(CASE WHEN MONTH(added_time) = 7 AND DAYNAME(added_time) = 'Monday' THEN 1 ELSE NULL END) monlug,
COUNT(CASE WHEN MONTH(added_time) = 8 AND DAYNAME(added_time) = 'Monday' THEN 1 ELSE NULL END) monago,
COUNT(CASE WHEN MONTH(added_time) = 9 AND DAYNAME(added_time) = 'Monday' THEN 1 ELSE NULL END) monset,
COUNT(CASE WHEN MONTH(added_time) = 10 AND DAYNAME(added_time) = 'Monday' THEN 1 ELSE NULL END) monott,
COUNT(CASE WHEN MONTH(added_time) = 11 AND DAYNAME(added_time) = 'Monday' THEN 1 ELSE NULL END) monnov,
COUNT(CASE WHEN MONTH(added_time) = 12 AND DAYNAME(added_time) = 'Monday' THEN 1 ELSE NULL END) mondic
FROM shipping_details
WHERE DAYNAME(added_time) = 'Monday'
UNION
SELECT DAYNAME(added_time) = 'Tuesday',
COUNT(CASE WHEN MONTH(added_time) = 1 AND DAYNAME(added_time) = 'Tuesday' THEN 1 ELSE NULL END) tuegen,
COUNT(CASE WHEN MONTH(added_time) = 2 AND DAYNAME(added_time) = 'Tuesday' THEN 1 ELSE NULL END) tuefeb,
COUNT(CASE WHEN MONTH(added_time) = 3 AND DAYNAME(added_time) = 'Tuesday' THEN 1 ELSE NULL END) tuemar,
COUNT(CASE WHEN MONTH(added_time) = 4 AND DAYNAME(added_time) = 'Tuesday' THEN 1 ELSE NULL END) tueapr,
COUNT(CASE WHEN MONTH(added_time) = 5 AND DAYNAME(added_time) = 'Tuesday' THEN 1 ELSE NULL END) tuemag,
COUNT(CASE WHEN MONTH(added_time) = 6 AND DAYNAME(added_time) = 'Tuesday' THEN 1 ELSE NULL END) tuegiu,
COUNT(CASE WHEN MONTH(added_time) = 7 AND DAYNAME(added_time) = 'Tuesday' THEN 1 ELSE NULL END) tuelug,
COUNT(CASE WHEN MONTH(added_time) = 8 AND DAYNAME(added_time) = 'Tuesday' THEN 1 ELSE NULL END) tueago,
COUNT(CASE WHEN MONTH(added_time) = 9 AND DAYNAME(added_time) = 'Tuesday' THEN 1 ELSE NULL END) tueset,
COUNT(CASE WHEN MONTH(added_time) = 10 AND DAYNAME(added_time) = 'Tuesday' THEN 1 ELSE NULL END) tueott,
COUNT(CASE WHEN MONTH(added_time) = 11 AND DAYNAME(added_time) = 'Tuesday' THEN 1 ELSE NULL END) tuenov,
COUNT(CASE WHEN MONTH(added_time) = 12 AND DAYNAME(added_time) = 'Tuesday' THEN 1 ELSE NULL END) tuedic
FROM shipping_details
WHERE DAYNAME(added_time) = 'Tuesday'



It returns this json:


["DAYNAME(added_time) = 'Monday'":"1","mongen":"0","monfeb":"5","monmar":"0","monapr":"2","monmag":"40","mongiu":"63","monlug":"96","monago":"10","monset":"0","monott":"0","monnov":"0","mondic":"0","DAYNAME(added_time) = 'Monday'":"1","mongen":"0","monfeb":"10","monmar":"3","monapr":"2","monmag":"38","mongiu":"59","monlug":"106","monago":"18","monset":"0","monott":"0","monnov":"0","mondic":"0"]



How to modify query so it will return a json like this?


["added_time = 'Monday'","mongen":"0","monfeb":"5","monmar":"0","monapr":"2","monmag":"40","mongiu":"63","monlug":"96","monago":"10","monset":"0","monott":"0","monnov":"0","mondic":"0","added_time = 'Tuesday'","tuegen":"0","tuefeb":"10","tuemar":"3","tueapr":"2","tuemag":"38","tuegiu":"59","tuelug":"106","tueago":"18","tueset":"0","tueott":"0","tuenov":"0","tuedic":"0"]



Thanks in advance,



Nico



Ok after rethinking the query I need this json:


["added_time":"Monday","gen":"0","feb":"5","mar":"0","apr":"2","mag":"40","giu":"63","lug":"96","ago":"10","aet":"0","ott":"0","nov":"0","dic":"0","added_time":"Tuesday","gen":"0","feb":"10","mar":"3","apr":"2","mag":"38","giu":"59","lug":"106","ago":"18","aet":"0","ott":"0","nov":"0","dic":"0"]



The wrong query I have right now is this:


SELECT added_time,
COUNT(CASE WHEN DAYNAME(added_time) = 'Monday' AND MONTH(added_time) = 1 THEN 1 ELSE NULL END) gen,
COUNT(CASE WHEN DAYNAME(added_time) = 'Monday' AND MONTH(added_time) = 2 THEN 1 ELSE NULL END) feb,
COUNT(CASE WHEN DAYNAME(added_time) = 'Monday' AND MONTH(added_time) = 3 THEN 1 ELSE NULL END) mar,
COUNT(CASE WHEN DAYNAME(added_time) = 'Monday' AND MONTH(added_time) = 4 THEN 1 ELSE NULL END) apr,
COUNT(CASE WHEN DAYNAME(added_time) = 'Monday' AND MONTH(added_time) = 5 THEN 1 ELSE NULL END) mag,
COUNT(CASE WHEN DAYNAME(added_time) = 'Monday' AND MONTH(added_time) = 6 THEN 1 ELSE NULL END) giu,
COUNT(CASE WHEN DAYNAME(added_time) = 'Monday' AND MONTH(added_time) = 7 THEN 1 ELSE NULL END) lug,
COUNT(CASE WHEN DAYNAME(added_time) = 'Monday' AND MONTH(added_time) = 8 THEN 1 ELSE NULL END) ago,
COUNT(CASE WHEN DAYNAME(added_time) = 'Monday' AND MONTH(added_time) = 9 THEN 1 ELSE NULL END) aet,
COUNT(CASE WHEN DAYNAME(added_time) = 'Monday' AND MONTH(added_time) = 10 THEN 1 ELSE NULL END) ott,
COUNT(CASE WHEN DAYNAME(added_time) = 'Monday' AND MONTH(added_time) = 11 THEN 1 ELSE NULL END) nov,
COUNT(CASE WHEN DAYNAME(added_time) = 'Monday' AND MONTH(added_time) = 12 THEN 1 ELSE NULL END) dic
FROM shipping_details
WHERE DAYNAME(added_time) = 'Monday'
UNION
SELECT added_time,
COUNT(CASE WHEN DAYNAME(added_time) = 'Tuesday' AND MONTH(added_time) = 1 THEN 1 ELSE NULL END) gen,
COUNT(CASE WHEN DAYNAME(added_time) = 'Tuesday' AND MONTH(added_time) = 2 THEN 1 ELSE NULL END) feb,
COUNT(CASE WHEN DAYNAME(added_time) = 'Tuesday' AND MONTH(added_time) = 3 THEN 1 ELSE NULL END) mar,
COUNT(CASE WHEN DAYNAME(added_time) = 'Tuesday' AND MONTH(added_time) = 4 THEN 1 ELSE NULL END) apr,
COUNT(CASE WHEN DAYNAME(added_time) = 'Tuesday' AND MONTH(added_time) = 5 THEN 1 ELSE NULL END) mag,
COUNT(CASE WHEN DAYNAME(added_time) = 'Tuesday' AND MONTH(added_time) = 6 THEN 1 ELSE NULL END) giu,
COUNT(CASE WHEN DAYNAME(added_time) = 'Tuesday' AND MONTH(added_time) = 7 THEN 1 ELSE NULL END) lug,
COUNT(CASE WHEN DAYNAME(added_time) = 'Tuesday' AND MONTH(added_time) = 8 THEN 1 ELSE NULL END) ago,
COUNT(CASE WHEN DAYNAME(added_time) = 'Tuesday' AND MONTH(added_time) = 9 THEN 1 ELSE NULL END) aet,
COUNT(CASE WHEN DAYNAME(added_time) = 'Tuesday' AND MONTH(added_time) = 10 THEN 1 ELSE NULL END) ott,
COUNT(CASE WHEN DAYNAME(added_time) = 'Tuesday' AND MONTH(added_time) = 11 THEN 1 ELSE NULL END) nov,
COUNT(CASE WHEN DAYNAME(added_time) = 'Tuesday' AND MONTH(added_time) = 12 THEN 1 ELSE NULL END) dic
FROM shipping_details
WHERE DAYNAME(added_time) = 'Tuesday'



It returns this wrong json:


["added_time":"2018-02-12 09:23:29","gen":"0","feb":"5","mar":"0","apr":"2","mag":"40","giu":"63","lug":"96","ago":"10","aet":"0","ott":"0","nov":"0","dic":"0","added_time":"2018-02-13 09:32:07","gen":"0","feb":"10","mar":"3","apr":"2","mag":"38","giu":"59","lug":"106","ago":"18","aet":"0","ott":"0","nov":"0","dic":"0"]



How to modify the query so it will be added_time":"Monday" and not added_time":"2018-02-12 09:23:29?


added_time":"Monday"


added_time":"2018-02-12 09:23:29



Thanks for your help,



Nico





That's not valid JSON, the first entry ("added_time = 'Monday'") has no value associated with it.
– Nick
Aug 12 at 13:13


"added_time = 'Monday'"





Add some sample data and expected sql output of the query
– Joakim Danielson
Aug 12 at 19:03




1 Answer
1



Change this:


SELECT DAYNAME(added_time) = 'Monday',



to:


SELECT DAYNAME(added_time) as added_time,



Your version is added a boolean variable with no name -- hence the name is defaulted to the expression and the value is 0/1. You want to name the column, so use as. I would call it something like day_of_week, but you seem to prefer added_time.


as


day_of_week


added_time



I would suggest that you change the entire query to:


SELECT DAYNAME(added_time) as added_time,
SUM(MONTH(added_time) = 1) as mongen,
SUM(MONTH(added_time) = 2) as monfeb,
. . .
FROM shipping_details
GROUP BY DAYNAME(added_time)



A single GROUP BY seems much simpler than a UNION ALL. The use of SUM() with a boolean expression is a MySQL extension that is quite convenient (and makes sense in the context of other programming languages).


GROUP BY


UNION ALL


SUM()






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