On 2021-03-19 7:11 PM, Thomas Kellerer wrote:
Frank Millman schrieb am 19.03.2021 um 10:16:
cl_bal selects WHERE tran_date <= '2018-03-31'.
op_bal selects WHERE tran_date < '2018-03-01'.
The second one could be written as WHERE tran_date <= '2018-02-28',
but I don't think that would make any difference.
I knew I overlooked something ;)
But as one is a true subset of the other, I think you can merge that
into a single SELECT statement:
select '2018-03-01' AS op_date,
'2018-03-31' AS cl_date,
a.source_code_id,
sum(a.tran_tot) AS cl_tot,
sum(a.tran_tot) filter (where tran_date < '2018-03-01') AS
op_tot
FROM (
SELECT distinct on (location_row_id, function_row_id,
source_code_id) source_code_id, tran_tot, tran_date
FROM prop.ar_totals
WHERE deleted_id = 0
AND tran_date <= '2018-03-31'
AND ledger_row_id = 1
ORDER BY location_row_id, function_row_id, source_code_id,
tran_date DESC
) AS a
GROUP BY a.source_code_id
Thanks very much Thomas - I did not know about FILTER.
But it does not quite work. If the SELECT does find a row where the max
tran_date is <= '2018-03-31' it correctly includes it in 'cl_tot'. But
the filter returns nothing for 'op_tot' because there is no
corresponding row where tran_date < '2018-03-01'.
But I have learned something new, so thanks for that.
Frank
