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

UNION'd queries should produce the same columns (name, type). Set unused columns to NULL or use a differenciation column:

SELECT
     SUM(count) as `total`,
     'today' as `when`
FROM
     statistics
WHERE
     name = "test"
 AND $P{oneDayAgo} <= datetime
 AND datetime <= $P{now}
UNION
SELECT
     SUM(count) as `total`,
     'thisWeek' as `when`
FROM
     statistics
WHERE
     name = "test"
 AND $P{oneWeekAgo} <= datetime
 AND datetime <= $P{now}
UNION
SELECT
     SUM(count) as `total`,
     'thisMonth' as `when`
FROM
     statistics
WHERE
     name = "test"
 AND $P{oneMonthAgo} <= datetime
 AND datetime <= $P{now}

Answer 2

You have 2 options:

1) Remove the 'as' part of each query and then it will come as 1 column that won't have a name

2) Create a temp table and insert those rows into a temp table and then query the temp table

Answer 3

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.