by Mohamed El Desouki – محمد الدسوقى [email protected] Tel :00966 553450836 جامعة سلمان بن عبدالعزيز – السعودية – الخرج Relational Algebra Operations – Join in Arabic Text Book: Fundamentals of Database Systems, 5th Edition, by Elmasri/Navathe, published by Addison-W