Skip site navigation (1) Skip section navigation (2)

Re: comparing rows

From: Don Baccus <dhogaza(at)pacifier(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Thomas Lockhart <lockhart(at)alumni(dot)caltech(dot)edu>
Cc: Magnus Hagander <mha(at)sollentuna(dot)net>, Tatsuo Ishii <t-ishii(at)sra(dot)co(dot)jp>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: comparing rows
Date: 2000-08-03 14:32:36
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
At 10:07 AM 8/3/00 -0400, Tom Lane wrote:
>Thomas Lockhart <lockhart(at)alumni(dot)caltech(dot)edu> writes:
>> btw, it appears that SQL99 (haven't checked SQL92) specifies that
>> test=# select (1,2,3) = (1,2,null);
>>  ?column? 
>> ----------
>> (1 row)
>> should return FALSE, not NULL.
>What?  If so, they broke it pretty badly. 

Date disagrees with Thomas on this one, too.

On the other hand, select (2,2,3) = (1,2,null) would be false
because 1 <> 2, therefore the result is not unknown.

- Don Baccus, Portland OR <dhogaza(at)pacifier(dot)com>
  Nature photos, on-line guides, Pacific Northwest
  Rare Bird Alert Service and other goodies at

In response to

pgsql-hackers by date

Next:From: Don BaccusDate: 2000-08-03 14:35:13
Subject: Re: comparing rows
Previous:From: Bruce MomjianDate: 2000-08-03 14:24:28
Subject: Re: comparing rows

Privacy Policy | About PostgreSQL
Copyright © 1996-2017 The PostgreSQL Global Development Group