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[Music] you this is a single table join index when you first see this you might say why would I do that but this is very clever and how this might work here we say create join index give it a name and ID X as Im selecting employee number Department first name last name salary from the employee table but Im giving it a different primary index the real table has employee number as the primary index as an OB unique primary index but this has Department number as the primary index weve just created a single table joint index next well figure out why we did this I love a single table joint index and Ill give you some reasons as we go along but this is really important if youre gonna be able to understand and follow what Im saying you really do have a good handle on what youre doing here now lets talk about the employee table and then well talk about the single table joint index that we created in our employee table up here Ive got this just on a single amp the primary index is e