How to distribute budget value to actual rows in Postgresql
От | Andrus |
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Тема | How to distribute budget value to actual rows in Postgresql |
Дата | |
Msg-id | C22281FBB47749529C11968F04C83B16@dell2 обсуждение исходный текст |
Ответы |
Re: How to distribute budget value to actual rows in Postgresql
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Список | pgsql-general |
Budget table contains jobs with loads: create temp table budget ( job char(20) primary key, load numeric(4,1) not null check (load>0 ) ); insert into budget values ( 'programmer', 3 ); insert into budget values ( 'analyst', 1.5 ); Actual table contains actual loads by employees: create temp table actual ( job char(20), employee char(20), load numeric(4,1) not null check (load>0 ), contractdate date, primary key (job, employee) ); insert into actual values ( 'programmer', 'John', 1, '2014-01-01' ); -- half time programmer: insert into actual values ( 'programmer', 'Bill', 0.5, '2014-01-02' ); insert into actual values ( 'analyst', 'Aldo', 1, '2014-01-03' ); insert into actual values ( 'analyst', 'Margaret', 1, '2014-01-04' ); Result table should show difference between budget and actual jobs so that budget load is distributed to employees in contract date order. If budget load is greater than sum of job loads, separate budget line with empty employee should appear. In data above, 1.5 programmers are missing and 0.5 analysts are more. Result should be Job Employee Budget Actual Difference programmer John 1 1 0 programmer Bill 0.5 0.5 0 programmer 1.5 0 1.5 analyst Aldo 1 1 0 analyst Margaret 0.5 1 -0.5 How to create such table in modern Postgresql ? Can rank function with full join used or other idea ? I tried select coalesce(budget.job, actual.job ) as job, employee, budget.load as budget, coalesce(actual.load,0) as actual, coalesce(budget.load,0)-coalesce( actual.load,0) as difference from budget full join actual on (job) order by contractdate but this does not distribute budget load to employee rows. I posted this also in http://stackoverflow.com/questions/21664842/how-to-distribute-budget-value-to-actual-rows-in-postgresql Andrus.
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