Data Definition Language (DDL)

 What is Data Definition Language (DDL)?


A core component of database administration is Data Definition Language (DDL), which enables users to create, change, and destroy database objects including tables, views, indexes, and schemas. To maintain the consistency and integrity of the database schema, database administrators and developers must use this tool.

DDL statements are used to perform the following operations:

CREATE: Used to create a new database object, such as a table, view, index, or schema.
ALTER: Used to modify an existing database object, such as a table, column, or constraint.
DROP: Used to remove an existing database object, such as a table, view, index, or schema.
TRUNCATE: Used to remove all data from a table, but keep the table structure intact.


DDL gives users the ability to specify the database's structure, including data types, restrictions, and connections between tables. This is one of its main advantages. This guarantees that data is consistently and accurately saved in the database and enables quick data analysis and querying.

DDL statements can also be used to change the database's structure as necessary, for as by adding new tables or columns or removing existing ones. Due to its adaptability, the database can respond to shifting business requirements, guaranteeing that it will always be current and helpful.


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