The division operator might be the hardest operator to understand on the relational algebra query language. I've seen many people confused about it, and personally I had a hard time with it when I was studying relational algebra. I was solving some queries and found an incorrect solution on a complex query (I didn't know it was incorrect!) that confused me a lot. So while I found out it was wrong (a professor from my university corrected it) I found out an easy way of seeing what the operator does. I wrote it all down hoping it will help someone some day.
- The latex file of the document.
- The latest PDF generated from the latex file.