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

Re: [HACKERS] Unique index using hash?

From: Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us>
To: ocie(at)paracel(dot)com
Cc: hackers(at)postgreSQL(dot)org
Subject: Re: [HACKERS] Unique index using hash?
Date: 1998-03-17 03:02:49
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
> I was playing around with my latest compile and tried to make a unique
> index on two columns, using a hash method.  Both of these (more than
> one column and unique) are currently not allowed for hash indexes.
> I thought about this for a bit and realized that making a NESTED hash
> index (index on a and b also serves as an index on a) would be a
> trick, but allowing the unique clause should not be a problem.
> Therefore, I would like to try implementing unique constraints on hash
> indexes.  Has this come up before?  Are there any reasons not to
> support this?  As far as I understand, specifying an index method is
> non standard (above and beyond standard) to begin with.

It is on the TODO list:

	* add UNIQUE capability to non-btree indexes

Bruce Momjian                          |  830 Blythe Avenue
maillist(at)candle(dot)pha(dot)pa(dot)us              |  Drexel Hill, Pennsylvania 19026
  +  If your life is a hard drive,     |  (610) 353-9879(w)
  +  Christ can be your backup.        |  (610) 853-3000(h)

In response to

pgsql-hackers by date

Next:From: Bruce MomjianDate: 1998-03-17 03:20:48
Subject: Re: [HACKERS] Re: [PATCHES] patches for 6.2.1p6
Previous:From: Thomas G. LockhartDate: 1998-03-17 02:52:04
Subject: Re: [QUESTIONS] UPDATE statement ORACLE 6 compatible

Privacy Policy | About PostgreSQL
Copyright © 1996-2018 The PostgreSQL Global Development Group