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What are the three classes of SQL expression?
SQL expression consists of three clauses:
Select
From
Where
Database Recovery And Security Introduction In this part we will introduce two main issues relating to database management systems. A computer system suffers from dissi
What is a Built-in A notation of identity is built-into the data model or programming language and no user-supplied identifier is needed. This form of identity is used in objec
In which relational modes, cardinality is termed? Answer : Cardinality is termed in a number of tuples relational modes.
what is specialization?
Give the two reasons for allowing concurrency
How to use Oracle
What are the advantages of using a DBMS? The benefits of using a DBMS are a) Controlling redundancy b) Restricting unauthorized access c) Giving multiple user interfac
Describe Database state in details? Database state: The actual data within the database at a particular moment in time is known as a database state.
Explain several types of constraints that can be specified using CREATE TABLE command. Explain CASCADE and RESTRICT clauses of DROP SCHEMA command? Constraint Description PRIM
what are the reasons having variable length records
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