AB -> C (جايه في الامتحان بكره ان شاء الله)

If the following functional dependencies in relation R (A, B, C, D ) , AB -> C , BC -> D

Third Normal Form [3NF] A relation that is in First and Second Normal Form and in which no non-primary-key attribute is transitively dependent on the primary key,

If A->B and B->C are two FDs then A->C is called transitive dependency.

The normalization of 2NF relations to 3NF involves the

If a transitive dependency exists, we remove the transitively dependent attribute(s) from the relation by placing the attribute(s) in a new relation along with a copy of the determinant.

2NF is considered adequate for normal relational

… is a software used to manage data from a database.

popular databases are

… is a system that enables you to store, modify and retrieve data in an organized way. It also provides security to the database

refers to the process of identifying a user.

refers to the process of determining what a user can do.

DBMS provides many operations e.g. creating a database, storing in the database, updating an existing database, delete from the database.

DBMS advantages

is the statement of the security that the system is expected to enforce

If multiple users are logging into the same database simultaneously, the database does not show any lagging

is referring to the accuracy or correctness of the data in datab

Concurrency make DBMS work is completed faster.

are basically Boolean expressions that must evaluate to TRUE

DBMS is managed in such a way that the database processes the backup Manually and recovers the data if any data loss happens.