From: Julie Robinson <funkjunk@bellsouth.net>
To: pgsql-sql@postgresql.org
Subject: SQL Query Newbie Help
Date: Fri, 24 Mar 2006 10:24:52 -0600
Message-ID: <12287b48nref60f@corp.supernews.com> (raw)
Given the two tables at the bottom of this email, I'm having trouble
coming up with a SQL statement that returns all rows in the
quality_control_reset table where there is only one row for the most
recent quality_control_range. Help?
Example:
In table quality_control_reset:
id | timestamp | qualitycontrolrange
---------------------------------------------
1 | 02/23/2006 | 20
2 | 02/23/2006 | 6
3 | 02/28/2006 | 18
4 | 03/01/2006 | 18
5 | 03/23/2006 | 12
6 | 03/23/2006 | 20
I want the results of the following from the query:
id | timestamp | qualitycontrolrange
---------------------------------------------
2 | 02/23/2006 | 6
4 | 03/01/2006 | 18
5 | 03/23/2006 | 12
6 | 03/23/2006 | 20
CREATE TABLE quality_control_reset
(
id int8 NOT NULL,
date timestamp,
qualitycontrolrange int8,
CONSTRAINT quality_control_reset_pkey PRIMARY KEY (id),
CONSTRAINT fk42a706efb62efa94 FOREIGN KEY (qualitycontrolrange)
REFERENCES quality_control_range (id) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION
)
CREATE TABLE quality_control_range (
id int8 NOT NULL,
code varchar(255),
CONSTRAINT quality_control_range_pkey PRIMARY KEY (id)
);
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To: pgsql-sql@postgresql.org
Cc: funkjunk@bellsouth.net
Subject: Re: SQL Query Newbie Help
In-Reply-To: <12287b48nref60f@corp.supernews.com>
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