On 16 January 2013 20:23, Robert James <srobertjames@xxxxxxxxx> 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
