Aquaholic :
I am using the following mySQL query for summing up "volume" column for each month
SELECT DATE_FORMAT(date, "%m-%Y") AS Month,
SUM(vol)
FROM tbl
GROUP BY DATE_FORMAT(date, "%m-%Y")
order by Month
It produces the right output as expected on monthly basis:
(Above is image capture from excel)
Now, I want to change it to quarterly (i.e. 3-monthly) summation, or six-monthly summation.
What changes are needed to the above query?
I am unable to find any equivalent of %m for quarter or for six-month, hence the question.
GMB :
If you want this per quarter, you can do:
select year(date) yr, quarter(date) qr, sum(vol) sum_vol
from tbl
group by yr, qr
order by yr, qr
Or if you want to concatenate the year and quarter in a single column:
select concat(year(date), '-Q', quarter(date)) yr_qr, sum(vol) sum_vol
from tbl
group by yr_qr
order by yr_qr
To split by semester, you need a little more work:
select
concat(year(date), '-S', case when month(date) between 1 and 6 then 1 else 2 end) yr_sr,
sum(vol)
from tbl
group by yr_sr
order by yr_sr
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