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Re: Select statement problem

From: Lukasz Brodziak <lukasz(dot)brodziak(at)gmail(dot)com>
To: Frank Bax <fbax(at)sympatico(dot)ca>
Cc: PostgreSQL List - Novice <pgsql-novice(at)postgresql(dot)org>
Subject: Re: Select statement problem
Date: 2010-10-11 06:56:24
Message-ID: AANLkTimJN_imhqztEh9Bx09ebLcMJKgbPMKK=1_W9tKG@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-novice
They ought to be joined just like You've written but there is a small
bug :) when I run the statement against physical data if _ have one
person who has procedures which have end_date filled and procedures
with null end_date (opened) they appear in results as two separate
rows one with the 'SUM' column filled and days column null and the
other is all the way round.

2010/10/8 Frank Bax <fbax(at)sympatico(dot)ca>:
> It is not clear how these two queries should be joined; but you want to use
> something like this...
>
> SELECT sql1.col1, sql1.col2, sql1.sum, sql2.days from (
>
> SELECT t1.col3, t1.col4, t1.col1, t1.col2,
>   SUM(t2.end_date::DATE - t2.start_date::DATE) as sum
>   from table1 t1, table2 t2, table3 t3 WHERE t1.col3 = t2.col3 and
>   t3.col4 = t1.col4
>
> ) sql1 left join (
>
> SELECT t1.col3, t1.col4, t1.col1, t1.col2,
>   (Now()::DATE - t2.start_date::DATE) AS days
>   from table1 t1, table2 t2, table3 t3 WHERE t1.col3 = t2.col3 and
>   t3.col4 = t1.col4 and t2.end_date is null
>
> ) sql2 on sql1.col3 = sql2.col3 and sql1.col4 = sql2.col4
>
> Frank
>
>
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-- 
Łukasz Brodziak
II MU Bioinformatyka

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