1. Database
Dr. Roueida Mohammed

2. The Relational Data Model
 Specific relational data model concepts like attributes, tuples, domains, relations, domains, schemas, keys
 The relational data model constraints like entity integrity, referential integrity, and semantic constraints which are used to enforce rules on a relational database
 Relational algebra operations like union, intersection, difference, Cartesian product, selection, projection, join and division which are used to manipulate relations in a relational data model
 Relational calculus which is an alternative to the relational algebra as a candidate for the manipulative part of the model

3. Basic concepts
Attributes
Domains
Tuples
Relations
Schemas
Keys

4. The types of keys:
Candidate keys
Primary keys
. Foreign keys

5. Relational data model constraints
. Entity integrity constraint
Referential integrity constraint
Semantic integrity constraints

6. Transforming an E/R Design into a Relational Design
 Turn each entity set into a relation with the same set of attributes.
 Replace a relationship by a relation whose attributes are the keys for the connected entity sets.

7. Relational algebra
Relational algebra is a set of operators to manipulate relations. Each operator of the relational algebra takes either one or two relations as its input and produces a new relation as its output.

8. We defined 8 such operators, two groups of 4 each:
 The traditional set operations: union, intersection, difference and Cartesian product
 The special relational operations: select, project, join and divide.