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Which commands provide definitions for creating table structure, deleting relations and modifying relation schemas?
- a)DDL
- b)DML
- c)DCL
- d)DQL
Correct answer is option 'A'. Can you explain this answer?
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Which commands provide definitions for creating table structure, delet...
DDL commands provide definitions for creating table structure, deleting relations and modifying relation schemas.
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Which commands provide definitions for creating table structure, delet...
Understanding DDL (Data Definition Language)
Data Definition Language (DDL) is a subset of SQL (Structured Query Language) that is primarily concerned with the structure of the database. It allows users to define, modify, and delete database structures such as tables, schemas, and indexes.
Key Functions of DDL:
Other SQL Categories:
Conclusion:
In summary, DDL is essential for defining and managing the structure of a database, which includes creating, deleting, and modifying tables and schemas. Hence, the correct answer to the question is option 'A' - DDL.
Data Definition Language (DDL) is a subset of SQL (Structured Query Language) that is primarily concerned with the structure of the database. It allows users to define, modify, and delete database structures such as tables, schemas, and indexes.
Key Functions of DDL:
- Create Table Structure: DDL commands like CREATE TABLE are used to define a new table along with its columns, data types, and constraints.
- Delete Relations: The DROP TABLE command allows users to remove a table from the database, effectively deleting all its data and structure.
- Modify Relation Schemas: ALTER TABLE is a command that modifies an existing table structure. It can add or remove columns, change data types, or enforce new constraints.
Other SQL Categories:
- DML (Data Manipulation Language): Focused on managing data within existing structures. It includes commands like INSERT, UPDATE, and DELETE.
- DCL (Data Control Language): Used for security and permissions management. Commands like GRANT and REVOKE fall under this category.
- DQL (Data Query Language): Primarily concerned with querying data. The SELECT command is the primary example here.
Conclusion:
In summary, DDL is essential for defining and managing the structure of a database, which includes creating, deleting, and modifying tables and schemas. Hence, the correct answer to the question is option 'A' - DDL.
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