Question

I have links put by users and in the database they
will be saved

for facebook the urls may be like this

http://www.facebook.com
http://facebook.com
https://facebook.com
facebook.com
http://www.facebook.com
https://www.facebook.com

But while showing the overall stats to facebook how do I query all at a time
Or is there a way to save the urls in database

Answer 1

You can make a scheme in a database that you store two pieces of data for each URL – the literal url and the standardized one. What you do is you store the URL how you see it (the variations listed above) but using a regular expression, you trim it down to something like facebook.com and store it in the database.

Now you can look up all facebook urls by searching facebook.com but you also know how each entry was entered originally.