This is my MySQL query for getting count values...
SELECT 1 AS id,
'2016' AS Year,
MAX( IF( Month = '01', Count, 0 ) ) AS 'VAL01',
MAX( IF( Month = '02', Count, 0 ) ) AS 'VAL02',
MAX( IF( Month = '03', Count, 0 ) ) AS 'VAL03',
MAX( IF( Month = '04', Count, 0 ) ) AS 'VAL04',
MAX( IF( Month = '05', Count, 0 ) ) AS 'VAL05',
MAX( IF( Month = '06', Count, 0 ) ) AS 'VAL06',
MAX( IF( Month = '07', Count, 0 ) ) AS 'VAL07',
MAX( IF( Month = '08', Count, 0 ) ) AS 'VAL08',
MAX( IF( Month = '09', Count, 0 ) ) AS 'VAL09',
MAX( IF( Month = '10', Count, 0 ) ) AS 'VAL10',
MAX( IF( Month = '11', Count, 0 ) ) AS 'VAL11',
MAX( IF( Month = '12', Count, 0 ) ) AS 'VAL12',
SUM( Count ) AS Total
FROM ( SELECT DATE_FORMAT( created_at, '%m' ) AS Month,
COUNT( 1 ) AS Count
FROM reservations
WHERE DATE_FORMAT( created_at, '%Y' ) = '2016'
GROUP BY DATE_FORMAT( created_at, '%m' )
) AS T1
UNION
SELECT 2 AS id,
'2017' AS Year,
MAX( IF( Month = '01', Count, 0 ) ) AS 'VAL01',
MAX( IF( Month = '02', Count, 0 ) ) AS 'VAL02',
MAX( IF( Month = '03', Count, 0 ) ) AS 'VAL03',
MAX( IF( Month = '04', Count, 0 ) ) AS 'VAL04',
MAX( IF( Month = '05', Count, 0 ) ) AS 'VAL05',
MAX( IF( Month = '06', Count, 0 ) ) AS 'VAL06',
MAX( IF( Month = '07', Count, 0 ) ) AS 'VAL07',
MAX( IF( Month = '08', Count, 0 ) ) AS 'VAL08',
MAX( IF( Month = '09', Count, 0 ) ) AS 'VAL09',
MAX( IF( Month = '10', Count, 0 ) ) AS 'VAL10',
MAX( IF( Month = '11', Count, 0 ) ) AS 'VAL11',
MAX( IF( Month = '12', Count, 0 ) ) AS 'VAL12',
SUM( Count ) AS Total
FROM ( SELECT DATE_FORMAT( created_at, '%m' ) AS Month,
COUNT( 1 ) AS Count
FROM reservations
WHERE DATE_FORMAT( created_at, '%Y' ) = '2017'
GROUP BY DATE_FORMAT( created_at, '%m' )
) AS T2
It returns (for example)...
+----+------+-------+-------+-------+-------+-------+-------+-----+-------+-------+
| id | Year | VAL01 | VAL02 | VAL03 | VAL04 | VAL05 | VAL06 | ... | VAL12 | Total |
+----+------+-------+-------+-------+-------+-------+-------+-----+-------+-------+
| 1 | 2016 | 0 | 0 | 150 | 190 | 200 | 220 | ... | 160 | 1242 |
+----+------+-------+-------+-------+-------+-------+-------+-----+-------+-------+
| 2 | 2017 | 300 | 300 | 600 | 600 | 700 | 0 | ... | 0 | 2500 |
+----+------+-------+-------+-------+-------+-------+-------+-----+-------+-------+
My query has many problems. It can't use the year 2018
and it should use UNION
again and again.
How can I make my SQL query more beautiful?
Try this
select
date_format(created_at,'%Y') as Year,
sum(case when date_format(created_at,'%m')='01' then 1 else 0 end) as val01,
sum(case when date_format(created_at,'%m')='02' then 1 else 0 end) as val02,
sum(case when date_format(created_at,'%m')='03' then 1 else 0 end) as val03,
sum(case when date_format(created_at,'%m')='04' then 1 else 0 end) as val04,
sum(case when date_format(created_at,'%m')='05' then 1 else 0 end) as val05,
sum(case when date_format(created_at,'%m')='06' then 1 else 0 end) as val06,
sum(case when date_format(created_at,'%m')='07' then 1 else 0 end) as val07,
sum(case when date_format(created_at,'%m')='08' then 1 else 0 end) as val08,
sum(case when date_format(created_at,'%m')='09' then 1 else 0 end) as val09,
sum(case when date_format(created_at,'%m')='10' then 1 else 0 end) as val10,
sum(case when date_format(created_at,'%m')='11' then 1 else 0 end) as val11,
sum(case when date_format(created_at,'%m')='12' then 1 else 0 end) as val12,
count(*) as total
from reservations
group by date_format(created_at,'%Y')
You can try with below query
SELECT YEAR,SUM(VAL01) VAL02,SUM(VAL02) VAL02,SUM(VAL03) VAL3
FROM
(
SELECT date_format(created_at,'%Y') YEAR,
CASE WHEN date_format(created_at,'%m')=1 THEN 1 ELSE 0 END AS VAL01,
CASE WHEN date_format(created_at,'%m')=2 THEN 1 ELSE 0 END AS VAL02,
CASE WHEN date_format(created_at,'%m')=3 THEN 1 ELSE 0 END AS VAL03
FROM reservations
)t
GROUP BY YEAR
Hope this will helps.
If this had been Oracle, you could have used Function based index on column Created_at and using the same function (EXTRACT in this case) in your query:
CREATE INDEX IDX1 ON RESERVATIONS (EXTRACT(YEAR FROM CREATED_AT))
Since, this is MySQL, try using this as alternative. Make sure after creating the index, it is getting used by verifying the Query plan.
You could try this query
SELECT id,
Year,
SUM(CASE WHEN Month='01' THEN MonthCount ELSE 0 END) AS 'VAL01',
SUM(CASE WHEN Month='02' THEN MonthCount ELSE 0 END) AS 'VAL02',
SUM(CASE WHEN Month='03' THEN MonthCount ELSE 0 END) AS 'VAL03',
SUM(CASE WHEN Month='04' THEN MonthCount ELSE 0 END) AS 'VAL04',
SUM(CASE WHEN Month='05' THEN MonthCount ELSE 0 END) AS 'VAL05',
SUM(CASE WHEN Month='06' THEN MonthCount ELSE 0 END) AS 'VAL06',
SUM(CASE WHEN Month='07' THEN MonthCount ELSE 0 END) AS 'VAL07',
SUM(CASE WHEN Month='08' THEN MonthCount ELSE 0 END) AS 'VAL08',
SUM(CASE WHEN Month='09' THEN MonthCount ELSE 0 END) AS 'VAL09',
SUM(CASE WHEN Month='10' THEN MonthCount ELSE 0 END) AS 'VAL10',
SUM(CASE WHEN Month='11' THEN MonthCount ELSE 0 END) AS 'VAL11',
SUM(CASE WHEN Month='12' THEN MonthCount ELSE 0 END) AS 'VAL12',
SUM(MonthCount) AS Total
FROM (
SELECT
CASE
WHEN Date_format(created_at, '%Y') = '2016' THEN 1
WHEN Date_format(created_at, '%Y') = '2017' THEN 2
WHEN Date_format(created_at, '%Y') = '2018' THEN 3
END AS id,
Date_format(created_at, '%Y') AS Year,
Date_format(created_at, '%m') AS Month,
COUNT(1) AS MonthCount
FROM reservations
WHERE Date_format(created_at, '%Y') IN ('2016', '2017', '2018')
GROUP BY Date_format(created_at, '%Y-%m')) AS ByMonth
GROUP BY id, Year
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