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What are the technique to define a schema completely ?
A schema is completely define by DDL and DML query language.
Name the various privileges in SQL? A) Delete B) Select C) Insert D) Update
In which format database schema is written ? Data base schema is written in the DDL format.
The advantages of a database management system (DBMS) include :- Data integrity and elimination of duplication.
Describe the primary key functions? Primary Key : The primary key is an attribute or a set of attributes in which uniquely identify a specific example of an entity. Every entit
Forward Recovery (Redo): In this system the committed changes made by a transaction are reapplied to a previous copy of the database. In simpler
How does a query tree represent a relational algebra expression? Discuss any three rules for query optimisation, giving example as to when should each rule be applied. Ans
what is cascading? what is rollback cascading? please explain in detail
Explain the structure of well formed formulae in relational calculus. Ans: a. An atom is a formula b. If P1 is a formula, after that so are ¬P1 and (P1) c. If P1 and P2 a
What is relational model feature? A relational model feature is much more data independence than some other database models.
milestone assignment
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