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What is DDL? Make a list of commands with short description used in DDL
Ans: Data Definition Language that is abbreviated as DDL is a computer language for defining data structures. The phrase was first introduced in relation to the Codasyl database model in which the schema of the database was written in a Data Definition Language explaining the records, fields, and "sets" making up the user Data Model.
List of DDL commands:
(a) To define a table/ relation
CREATE TABLE ------
(b) To eliminate table/relation definition
DROP TABLE ----
(iii) To alter the definition of an existing table
ALTER TABLE-------
Partial Key : It is a group of attributes that can uniquely identify small entities and that are related to same base entity. It is sometime named as Discriminator. Altern
What is assertion? Mention the forms available. An assertion is a predicate expressing a condition that we wish the database always to satisfy. Domain integrity constraints.
Determine object representation As a designer, we must choose properly that when to use primitive types in representing objects and when to combine groups of related objects,
In case of entity integrity, the primary key may be declared? In a case of entity integrity primary key may be not Null.
Do you have experts of the dbms
What is NULL? Simply NULL means not in value.
Update Operations and Dealing with Constraint Violations There are three basic operations to be executes on relations: Insertion Deletion Update The INSER
What does Aggregation mean?
which component of DBMS can be embedded in a program? The data manipulation language (DML) is a component which is embedded in a program.
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