On 16 January 2013 20:23, Robert James <srobertja...@gmail.com> wrote:
> Is there a recommended, high performance method to check for subdomains? > > Something like: > - www.google.com is subdomain of google.com > - ilikegoogle.com is not subdomain of google.com > > There are many ways to do this (lowercase and reverse the string, > append a '.' if not there, append a '%', and do a LIKE). But I'm > looking for one that will perform well when the master domain list is > an indexed field in a table, and when the possible subdomain is either > an individual value, or a field in a table for a join (potentially > indexed). > Maybe the ltree extension will suit what you are trying to do? http://www.postgresql.org/docs/9.2/static/ltree.html
