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What are the DBMS languages? Explain.
Ans: a) Data Definition Languages (DDL): It is employed to specify database schema for example CREATE DROP statements etc.
b) Data Manipulation language (DML): DML is employed to express database queries and update. For example: SELECT, UPDATE, DELETE statements, etc.
What are the several forms of identity? a) Value b) Name c) Built-in
What are the various symbols used to draw an E-R diagram (any 3)?
What is theta join explain? Theta Join - The theta join operation is an extension to the natural-join operation which permits us to merge selection and a Cartesian
What are the properties in a relation ? In a relation Ordering of rows is immaterial and No two rows are identical.
Which is an advantage of view? The Advantages of view is Data security, Derived columns and Hiding of complex queries
It is not possible to make an ABAP/4 program, which having only Subroutines. False. We can make ABAP/4 program, which having only Subroutines.
Determine the Persistent object Persistent object can be stored in one of the following: Files Cheap, permanent, simple storage Low level (Write, Read) Ap
The need for three level architecture The aim of the three level architecture is to divide each user's view of the database from the way the database is physically shown.
Define average latency time. The average latency time of the disk is one-half the time for a full rotation of the disk.
Example: RELATIONAL SCHEMA for PERSON: PERSON (PERSON_ID: integer, NAME: string, AGE: integer, ADDRESS: String) RELATION INSTANCE In this instance, m = 3 and n = 4
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