Requesting the database with some SQL inner join should get you less lines than both tables ? No ! It gets you a deadlock exception because some other program locks you...
Doing a DNS query to get IP address of an host ? Getting an IP ? Yes ? Everything ok ? No because some bit flipped somewhere and caused the result to be the IP address of foogle.com
So yes you are using maths but you are not doing maths.
Requesting the database with some SQL inner join should get you less lines than both tables ? No ! It gets you a deadlock exception because some other program locks you...
Doing a DNS query to get IP address of an host ? Getting an IP ? Yes ? Everything ok ? No because some bit flipped somewhere and caused the result to be the IP address of foogle.com
So yes you are using maths but you are not doing maths.