Message-ID: <4BAE87828F06EB45B2641B83D370350F4665@ostex002.ad.ost.dot.gov>
From: "Sill-II, Stephen" <Stephen.Sill-II@ost.dot.gov>
To: 'Achilleus Mantzios' <achill@matrix.gatewaynet.com>
Cc: "'pgsql-sql@postgresql.org'" <pgsql-sql@postgresql.org>
Subject: Re: look for latest user login in one table from a list of 
Date: Fri, 14 Mar 2003 12:15:24 -0500
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	charset="iso-8859-1"

Thanks VERY VERY VERY much,

After the following modifications, it works exactly as I need.

SELECT users."User-Name",someq.login_date,someq.login_time FROM users LEFT
OUTER JOIN (SELECT "User-Name",max("Date") AS login_date,max("Time") AS
login_time  FROM logs GROUP BY "User-Name") AS someq USING("User-Name");

THANKS!

-----Original Message-----
From: Achilleus Mantzios [mailto:achill@matrix.gatewaynet.com]
Sent: Friday, March 14, 2003 4:15 PM
To: Sill-II, Stephen
Cc: pgsql-sql@postgresql.org
Subject: Re: [SQL] look for latest user login in one table from a list
of users in a nother


On Fri, 14 Mar 2003, Sill-II, Stephen wrote:

> I'm trying to come up with an efficient way to do the following task, but
I
> haven't found the correct join syntax to do it.
> 
> I have table "users" for keeping a list of users I need to check logins
for.
> It contains the following fields:
> 
> id,Full-Name,User-Name
> 
> I have table called "logs" that contains the actual radius log data.  The
> three fields I am concerned with are:
> 
> User-Name,Date,Time
> 
> I have gotten thus far almost what I want with the following query.
> 
> SELECT users."User-Name",max(logs."Date") as login_date,max(logs."Time")
as
> login_time FROM logs where logs."User-Name"=users."User-Name" GROUP BY
> users."User-Name";

Try
foo=# SELECT users.name,someq.mlast from users left outer join (select 
id,max(last) as mlast from log group by id) as someq using(id);

substituting with your names.

> 
> This gives me the User-Name, date, and time of people WHO HAVE LOGGED IN.
> I'm looking to have a query that returns all of the users in the first
> table, including those who have not logged in.  I have an external perl
> script that generates a nice html report for the manager.  I have a script
> that parses the raw .csv files, but I'm trying to move it entirely to
> postgres, including if possible stored-procedures in plperl.  I already
have
> a perl script that imports the raw log files into the logs table.
> 
> Am I on the right track?
> 
> Thanks,
> 
> Stephen Sill II
> 
> 
> 
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-- 
==================================================================
Achilleus Mantzios
S/W Engineer
IT dept
Dynacom Tankers Mngmt
Nikis 4, Glyfada
Athens 16610
Greece
tel:    +30-210-8981112
fax:    +30-210-8981877
email:  achill@matrix.gatewaynet.com
        mantzios@softlab.ece.ntua.gr