Question

I need to find users that have been inserted twice in a table, but with their first name & last name swapped.

e.g. Bob Smith is in the database as

firstname:Bob 
lastname:Smith
&
firstname:Smith
lastname:Bob

What’s the best query to find those users?

The server runs mysql.

Answer 1

Select 
  *
FROM UserTable ut
JOIN UserTable ut2 on ut2.firstname = ut.lastname and ut2.lastname = ut.firstname