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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-------
Define the terms i) DDL ii) DML DDL: Data base schema is particular by a set of definitions expressed by a special language known as a data definition language. DML: A data
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What are multiple inheritances? Multiple inheritances allow a class to inherit variables and methods from many super classes.
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