mysql - How to aggregate (sum) values over month in jasperreports (each month should be the sum of all month before) -



mysql - How to aggregate (sum) values over month in jasperreports (each month should be the sum of all month before) -

i want study jasperreports aggregates our contracts on month adding new , old contracts month. database mysql database. select illustration info below:

select month(contract_date), amount contracts year(contract_date)=2013 grouping month(contract_date) 1.1.2013 300 1.1.2013 500 1.2.2013 250 1.3.2013 250

now get:

1 800 2 250 3 250 ...

but have:

1 800 2 1050 3 1300 ...

so each month contains amount of month before.

i dont mind if can in sql or jasperreports/ireport, solution welcome. there way can this?

mysql doesn't have ctes inconvenient, view in pinch.

create view monthlytotals select month( contractdate ) contractmonth, sum( contractqty ) totalqty contracts grouping contractmonth;

now can bring together view itself, maintaining running total of month , previous months:

select t1.contractmonth, t1.totalqty, sum( t2.totalqty ) runningtotal monthlytotals t1 bring together monthlytotals t2 on t2.contractmonth <= t1.contractmonth grouping t1.contractmonth;

the output matches desired output, seen @ sql fiddle.

mysql sql jasper-reports aggregate

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