Antijoin

Okay kiddo, imagine you have two groups of toys - one group has your favorite toys, and the other group has some toys you don't like. An antijoin is like picking up all of your favorite toys and putting them in a special spot, leaving the toys you don't like behind.

In computer terms, an antijoin is when you have two tables of data and you want to find all of the rows in one table that don't have matching values in the other table. So you only keep the rows with certain characteristics and discard the rest. Just like how you only kept your favorite toys and left the ones you didn't like.