XML Editor
Sign up for a WebBoard account Sign Up Keyword Search Search More Options... Options
Chat Rooms Chat Help Help News News Log in to WebBoard Log in Not Logged in
Show tree view Topic
Go to previous topicPrev TopicGo to next topicNext Topic
Postnext
sreekanth mopuruSubject: sequence distinct values
Author: sreekanth mopuru
Date: 23 May 2007 12:02 PM
What is the best way to combine two sequences with distinct values into a sequence with distinct values in a xquery?

For eg.
let $a := (1, 2, 3 )
let $b := (3, 2, 5, 6)

result should be ( 1,2,3, 5, 6)

distinct-values ( ($a, $b)) would probably get the result, but I am looking if there is any other efficient way to take advantage of the fact the sequences being merged are already distinct.

Thanks in advance,
Sreekanth

Postnext
Alberto MassariSubject: sequence distinct values
Author: Alberto Massari
Date: 23 May 2007 03:45 PM
Hi Sreekanth,
the two sequence are not distinct; also, distinct-values will not guarantee you the order you have written. But if you are looking for the fastest method, you should probably just benchmark the different methods and see which one suits best the XQuery engine you are using.

Alberto

Postnext
sreekanth mopuruSubject: sequence distinct values
Author: sreekanth mopuru
Date: 24 May 2007 09:48 AM
Order of items is not important, it should just get the distinct values.

Thanks,
Sreekanth

Posttop
Alberto MassariSubject: sequence distinct values
Author: Alberto Massari
Date: 25 May 2007 06:05 AM
Hi,
in this case distinct-values is your best option, as this is what it should do.

Alberto

 
Go to previous topicPrev TopicGo to next topicNext Topic
Download A Free Trial of Stylus Studio 6 XML Professional Edition Today! Powered by Stylus Studio, the world's leading XML IDE for XML, XSLT, XQuery, XML Schema, DTD, XPath, WSDL, XHTML, SQL/XML, and XML Mapping!  
go

Log In Options

Site Map | Privacy Policy | Terms of Use | Trademarks
Stylus Scoop XML Newsletter:
W3C Member
Stylus Studio® and DataDirect XQuery ™are from DataDirect Technologies, is a registered trademark of Progress Software Corporation, in the U.S. and other countries. © 2004-2016 All Rights Reserved.