Difference among a database schema and a database state, Database Management System

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What is the difference among a database schema and a database state?

The collection of information stored in database at particular moment in time is known as database state although the whole design of database is known as database schema.

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Synonyms, Synonyms It allows short names or alternative names for objects....

Synonyms It allows short names or alternative names for objects. Example : CREATE SYNONYM D30 FOR EMPD30; Now if we give command:

Explain data independence, Explain data independence ? Data independenc...

Explain data independence ? Data independence is the capacity to modify the schema at one stage of a database system without having to change the schema at the further level.

Operator precedence-data manipulation language, Operator Precedence The...

Operator Precedence The basic operators used in SQL are * / - + Operators of the similar priority are evaluated From Left to right Parentheses are used to force priorit

Attribute, a set of possible data value of an attribute is called??

a set of possible data value of an attribute is called??

Attributes, Attributes and its types explain?

Attributes and its types explain?

Concept of foreign key, Fundamentals of Database Management 1. Explai...

Fundamentals of Database Management 1. Explain the concept of Foreign Key. How a foreign key differs from a Primary Key? Can the Foreign Key accept nulls? 2. With a necess

Mapping Constraints, what is Mapping Constraints? with examples

what is Mapping Constraints? with examples

Develop a fragment of a hypothetical system, The objectives of this assignm...

The objectives of this assignment are: - to develop skills in the design of database driven applications - to develop skills in applying SQL to implement the relational and

Distinguish among a datareader class and a dataset class, Question (a) ...

Question (a) Concurrent access to data from a database is a normal part of application program usage. Describe three approaches to concurrency control (b) Distinguish among

Two types of blocks in the fixed -length representation, What are the two t...

What are the two types of blocks in the fixed -length representation? Define them. Anchor block: Have the first record of a chain. Overflow block: Have the records other tha

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