by Mohamed El Desouki [email protected] Tel :00966 553450836 جامعة سلمان بن عبد العزيز – السعودية – الخرج in this lecture we explain lesson 1 from section 02 of the course , it covers The following – Using the Describe command to get information about database objects – The use of concatenation operator to combine different strings and display them as a single output column -The use of Distinct keyword to eliminate duplicates from the output data