This question is about teaching: When I learned databases, we talked about indexes being like the card catalog in the town library. We had at least an author index, a title index, then the Dewey decimal number was the access path to the book, which is like the whole record in the database.
Books? What, on paper? Index cards in drawers?
The youngsters don't really know what I'm talking about, so how do we best explain it nowadays?
(Feel free to enjoy my lawn, just please recognize the difference between the grass and the astroturf at the prep school, ok?)
Best Answer
Best is to refer : Stairway to SQL Server Indexes
For more reading, you can refer to