How to query multiple SUMs of the same item using SQL in iReport

Question

• I\'m creating a JasperReport using iReport, and as such, I\'m limited* to one SQL query.

• I have a table \'statistics\', with a \'name\' (VARCHAR), \

Answer 1

sum(case when -condition- then count else 0 end)

SELECT
  SUM(case when $P{oneDayAgo} <= datetime then count else 0 end) as 'today',
  SUM(case when $P{oneWeekAgo} <= datetime then count else 0 end) as 'thisweek',
  SUM(count) as 'thismonth'
FROM
  statistics
WHERE
   name = "test"
  AND $P{oneMonthAgo} <= datetime
  AND datetime <= $P{now}

note that if you need averages, be sure to substitute NULL for 0.