Re: [SQL] several questions about R-tree index

2005-04-26 Thread Tom Lane
"TJ O'Donnell" <[EMAIL PROTECTED]> writes: > Shouldn't the ~ (contains) operator be included also? > Isn't ~ the commutator of @ ? Yeah, it looks like the documentation is in error: regression=# select amopopr::regoperator,amopstrategy from pg_amop where amopclaid in regression-# (select oid fro

Re: [SQL] several questions about R-tree index

2005-04-26 Thread Andrew - Supernews
On 2005-04-26, "TJ O'Donnell" <[EMAIL PROTECTED]> wrote: > But I think I might be able to do better (faster) using R-trees. > Bitstrings can be thought of as "containing" when one bitstring has all the > same bits set as another, even if it has other bits set too - this is the > gist of the first w

[SQL] several questions about R-tree index

2005-04-26 Thread TJ O'Donnell
According to the manual at: http://www.postgresql.org/docs/7.4/static/functions-geometry.html " The PostgreSQL query planner will consider using an R-tree index whenever an indexed column is involved in a comparison using one of these operators: <<, &<, &>, >>, @, ~=, && (Refer to Section 9.9 abo

Re: [SQL] UPDATE WITH ORDER BY

2005-04-26 Thread Rodrigo Carvalhaes
Thanksyou and Franz for your help. Simple and efficient... I was blind The plpgsql "for" is the perfect solution It was great. Have a nice week!!! Cheers, Rodrigo Carvalhaes Christoph Haller wrote: Rodrigo Carvalhaes wrote: Hi Guys! I need to make an UPDATE on a column reorder

Re: [SQL] people who buy A, also buy C, D, E

2005-04-26 Thread Christoph Haller
Dan Langille wrote: > > On 26 Apr 2005 at 14:24, Christoph Haller wrote: > > > Dan Langille wrote: > > > > > > The goal of my query is: given a book, what did other people who > > > bought this book also buy? I plan the list the 5 most popular such > > > books. In reality, this isn't about book

Re: [SQL] people who buy A, also buy C, D, E

2005-04-26 Thread Achilleus Mantzios
O Christoph Haller έγραψε στις Apr 26, 2005 : > Dan Langille wrote: > > > > The goal of my query is: given a book, what did other people who > > bought this book also buy? I plan the list the 5 most popular such > > books. In reality, this isn't about books, but that makes it easier > > to unde

Re: [SQL] people who buy A, also buy C, D, E

2005-04-26 Thread Dan Langille
On 26 Apr 2005 at 14:24, Christoph Haller wrote: > Dan Langille wrote: > > > > The goal of my query is: given a book, what did other people who > > bought this book also buy? I plan the list the 5 most popular such > > books. In reality, this isn't about books, but that makes it easier > > to u

Re: [SQL] people who buy A, also buy C, D, E

2005-04-26 Thread Christoph Haller
Dan Langille wrote: > > The goal of my query is: given a book, what did other people who > bought this book also buy? I plan the list the 5 most popular such > books. In reality, this isn't about books, but that makes it easier > to understand I think. > > We have a table of customer_id (watch_

Re: [SQL] UPDATE WITH ORDER BY

2005-04-26 Thread Christoph Haller
> Rodrigo Carvalhaes wrote: > > Hi Guys! > > I need to make an UPDATE on a column reordering it with a sequence > using order by a description. > Confusing??? Well.. Let me give an example... > > Today, my table it's organized like this: > > Code / Description > 9 Orange > 15