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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.
List the set operations of SQL? 1) Union 2) Intersect operation 3) The except operation
A Functional dependency is described by X Y between two groups of attributes Y and X that are subsets of R specifies a constraint on the possible tuple that can make a relation
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 a
In the architecture of a database system which external level used? In the architecture of a database system view external level used.
How many types of Views are there? There are Four types of views:- Database View Help View Projection View Maintenance View
Properties of a Transaction A transaction has four main properties. These are: Atomicity Consistency Isolation or Independence Durability or Permanen
what is Storage-Device Hierarchy question
What is schema
What does conceptual design work? A conceptual design involves modelling independent of the DBMS.
Define entity integrity and referential integrity. How does SQL allow specification of these? Ans: Entity Integrity Rule- If the attribute A of relation R is a prime attribut
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