When I run this simple query, The values of each table is being repeated, and I dont know why. Sorry I am beginner

问题

enter image description hereHere is the result i am getting when I run this simple query

Kevin Norwood Bacon 6.2
Alexander Rae Baldwin   6.2
Kevin Norwood Bacon 6.7
Alexander Rae Baldwin   6.7
Kevin Norwood Bacon 7.1
Alexander Rae Baldwin   7.1
Kevin Norwood Bacon 6.6
Alexander Rae Baldwin   6.6
Kevin Norwood Bacon 7.2
Alexander Rae Baldwin   7.2

来源：https://stackoverflow.com/questions/58988703/when-i-run-this-simple-query-the-values-of-each-table-is-being-repeated-and-i