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ALTER TABLE Command: This command is used for variation of existing structure of the table in the given situation:
Syntax
ALTER TABLE
You require to put many constraints like that the database integrity is not compromised.
State the terms Designing the database and Normalization Designing the database: Out of the ERD we have formed, it is very easy to verify the tables, the attributes which the
What are data models? Explain it detail? Entity relationship model Rectangles Ellipse Diamonds Lines Relational model Relational model use a collection
a brief definition
Lock Based Protocol A lock is nothing but a mechanism that tells the DBMS whether a particular data item is being used by any transaction for read/write purpose. As there are t
online eductional management system ke diagram
A collection of a same kind of entities is known as an Entity Set or entity type. Example: For the COLLEGE database defines earlier objects of concern are Students, Faculty,
Construct a clean ans concise ER diagram for the database indicating the cardinality mapping for Employee management syatem
What is deadlock? Neither of the transaction can ever proceed with its normal implementation. This situation is known as deadlock.
What is object containment? References among objects can be used to model dissimilar real-world concepts.
What is the way a particular application views the data from the database that the application uses? Sub schema is the way a particular application views the data from the data
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