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 14 of the course , it covers the following 1-what is database constraint ? 2–naming conventions for database constraints 3- What are the types of Database Constraints ? 4- Basic rules for working with constraints