Hi everyone.
I am trying to create a view that fills in missing values from a
secondary source. I am using PostgreSQL 8.0.3 on Fedora Linux Core 3.
I have two important views and two important tables. Everything works
find by itself but when I try to create an outer join between views
(that hit the same table) coalesce is giving bad results.
The first view is day_source_pre: View "reporting.day_source_pre"Column | Type | Modifiers
--------+------------------+-----------day | date |amount | double precision |source | text
|
View definition:
( SELECT acc_trans.transdate AS "day", sum(acc_trans.amount) AS amount,
payment_types.id AS source FROM acc_trans, payment_types WHERE (acc_trans.chart_id IN ( SELECT chart.id FROM
chart WHERE chart.accno ~~ '1300.%'::text)) AND acc_trans.source ~~
(('%source='::text || payment_types.id) || '%'::text) GROUP BY acc_trans.transdate, payment_types.id
UNIONSELECT acc_trans.transdate AS "day", sum(acc_trans.amount) AS amount,
'over/under' AS source FROM acc_trans WHERE (acc_trans.chart_id IN ( SELECT chart.id FROM chart WHERE
chart.accno~~ '1300.%'::text)) AND acc_trans.source ~~
'%Over/under%'::text GROUP BY acc_trans.transdate)
UNIONSELECT acc_trans.transdate AS "day", sum(acc_trans.amount) AS amount,
'Reset' AS source FROM acc_trans WHERE (acc_trans.chart_id IN ( SELECT chart.id FROM chart WHERE
chart.accno~~ '1300.%'::text)) AND acc_trans.source ~~
'%Reset%'::text GROUP BY acc_trans.transdate;
This works as expected by itself.
The second view is: View "reporting.day_inc_source"Column | Type | Modifiers
--------+------------------+-----------day | date |sum | double precision |source | text
|
View definition:SELECT acc_trans.transdate AS "day", sum(acc_trans.amount) AS sum,
acc_trans.source FROM acc_trans WHERE acc_trans.source IS NOT NULL GROUP BY acc_trans.transdate, acc_trans.source;
This works OK by itself.
The third view (which is where tthe problem is) is defined thuswise: View "reporting.day_source"Column |
Type | Modifiers
--------+------------------+-----------day | date |source | text |amount | double precision
|
View definition:SELECT day_inc_source."day", day_inc_source.source,
COALESCE(day_source_pre.amount, day_inc_source.sum * -1::double
precision) AS amount FROM reporting.day_source_pre RIGHT JOIN reporting.day_inc_source ON day_source_pre.amount =
day_inc_source.sum AND day_source_pre."day" = day_inc_source."day" WHERE (day_inc_source.source IN ( SELECT
payment_types.id FROM payment_types)) ORDER BY day_inc_source."day";
The problem seems to be somehow assuming that all amount columns in
day_source_pre are null. Is there something wrong in how this view is
working, or is it (more likely) my SQL syntax?
That I want to do is fill in a value from day_inc_source if and only if
it is not found in day_source_pre with the same date and amount.
Best Wishes,
Chris Travers
Metatron Technology Consulting