Re: compare 2 tables in sql

Hi Jonah,

Just a postscript. It is important to check
both ways. Because (sometimes) vice versa is
not necessarily true. Case in point below:

blitzen=> select * from foo
blitzen-> except
blitzen-> select * from moo;
alleleid | markerid | value | datecreated | datereplaced
----------+----------+-------+-------------+--------------
(0 rows)

blitzen=>
blitzen=> select * from moo
blitzen-> except
blitzen-> select * from foo;
some_id | anothrid | value | datecreated | datereplaced
----------+----------+-------+-------------------------+---------------------
2892473 | 2810329 | t | 2008-03-12 14:37:18.165 | 3000-01-01 12:00:00
(1 row)

Regards,

Tena Sakai
tsakai(at)gallo(dot)ucsf(dot)edu

-----Original Message-----
From: Jonah H. Harris [mailto:jonah(dot)harris(at)gmail(dot)com]
Sent: Wed 3/19/2008 3:39 PM
To: Tena Sakai
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Re: [SQL] compare 2 tables in sql

On Wed, Mar 19, 2008 at 1:56 PM, Tena Sakai <tsakai(at)gallo(dot)ucsf(dot)edu> wrote:
> Is there a sql way to compare (in a diff/cmp sense)
> 2 tables? For example,

SELECT * FROM foo
EXCEPT
SELECT * FROM moo;

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Jonah H. Harris, Sr. Software Architect | phone: 732.331.1324
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