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Home > Information Technology > Database > SQL Data Definition Language (DDL)

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24 Questions	Log in		Learn	00:00:00

1. Which DDL statement is used to add a new column to an existing table?

Explanation: The ADD COLUMN statement is used to add a new column to an existing table.
Report for correction

ADD COLUMN

ALTER COLUMN

INSERT COLUMN

UPDATE COLUMN

2. Which DDL statement is used to add a new constraint to an existing table?

Explanation: The ADD CONSTRAINT statement is used to add a new constraint to an existing table.
Report for correction

ADD CONSTRAINT

CREATE CONSTRAINT

MODIFY CONSTRAINT

SET CONSTRAINT

3. Which DDL statement is used to change the data type of a column in an existing table?

Explanation: ALTER COLUMN statements are used to change the data type of a column in an existing table.
Report for correction

ALTER COLUMN

MODIFY COLUMN

CHANGE COLUMN

CONVERT COLUMN

4. Which DDL statement is used to modify the name of a column in an existing table?

Explanation: The RENAME COLUMN statement is used to modify the name of a column in an existing table.
Report for correction

CHANGE COLUMN

ALTER COLUMN

RENAME COLUMN

MODIFY COLUMN

5. Which DDL statement is used to create a new table?

Explanation: The CREATE TABLE statement is used to create a new table in a database.
Report for correction

CREATE DATABASE

CREATE TABLE

CREATE INDEX

CREATE VIEW

6. Which DDL statement is used to create a unique constraint on a column?

Explanation: The ADD CONSTRAINT statement is used to create a unique constraint on a column.
Report for correction

CREATE UNIQUE

ADD UNIQUE

UNIQUE COLUMN

ADD CONSTRAINT

7. What does DDL stand for in SQL?

Explanation: DDL is used to define the structure of a database, including tables, constraints, and relationships.
Report for correction

Data Display Language

Data Description Language

Data Definition Language

Data Design Language

8. Which DDL statement is used to add a default value to a column?

Explanation: The SET DEFAULT statement is used to add a default value to a column.
Report for correction

DEFAULT VALUE

SET DEFAULT

ADD DEFAULT

MODIFY DEFAULT

9. Which DDL statement is used to delete a table from a database?

Explanation: The DROP TABLE statement is used to delete a table from a database.
Report for correction

DROP DATABASE

DELETE TABLE

REMOVE TABLE

DROP TABLE

10. Which DDL statement is used to remove a view?

Explanation: The DROP VIEW statement is used to remove a view.
Report for correction

DROP VIEW

DELETE VIEW

REMOVE VIEW

ALTER VIEW

11. What does the CASCADE option do when removing a foreign key constraint in DDL?

Explanation: The CASCADE option, when used with the removal of a foreign key constraint, will drop all dependent tables.
Report for correction

It deletes all rows in the table.

It drops all dependent tables.

It renames the table.

It modifies the table structure.

12. Which DDL statement is used to remove a FOREIGN KEY constraint from a table?

Explanation: The DROP FOREIGN KEY statement is used to remove a FOREIGN KEY constraint from a table.
Report for correction

REMOVE FOREIGN KEY

DROP FOREIGN KEY

DELETE FOREIGN KEY

ALTER FOREIGN KEY

13. Which DDL statement is used to remove a PRIMARY KEY constraint from a table?

Explanation: The DROP PRIMARY KEY statement is used to remove a PRIMARY KEY constraint from a table.
Report for correction

REMOVE PRIMARY KEY

DROP PRIMARY KEY

DELETE PRIMARY KEY

ALTER PRIMARY KEY

14. Which DDL statement is used to remove a UNIQUE constraint from a column?

Explanation: The DROP UNIQUE statement is used to remove a UNIQUE constraint from a column.
Report for correction

REMOVE UNIQUE

DROP UNIQUE

DELETE UNIQUE

ALTER UNIQUE

15. Which DDL statement is used to rename a table?

Explanation: The RENAME TABLE statement is used to rename a table in DDL.
Report for correction

RENAME TABLE

ALTER TABLE

MODIFY TABLE

RENAME COLUMN

16. What is the purpose of the INDEX keyword in DDL?

Explanation: The INDEX keyword is used to define an index on one or more columns in a table.
Report for correction

To create a new table

To add a new column to a table

To define an index on one or more columns

To modify the data type of a column

17. What is the purpose of the VIEW keyword in DDL?

Explanation: The VIEW keyword is used to define a virtual table based on the result of a query.
Report for correction

To create a new table

To define a virtual table based on a query

To add a new column to a table

To create an index on a column

18. What is the purpose of the ALTER TABLE statement in DDL?

Explanation: The ALTER TABLE statement is used to modify the structure of an existing table.
Report for correction

To delete a table

To modify an existing table

To insert data into a table

To query data from a table

19. What is the purpose of the TRUNCATE TABLE statement in DDL?

Explanation: The TRUNCATE TABLE statement is used to remove all rows from a table while keeping the table structure intact.
Report for correction

To delete specific rows from a table

To remove all rows from a table

To rename a table

To modify the data type of a column

20. What is the purpose of the CHECK constraint in DDL?

Explanation: The CHECK constraint is used to enforce data integrity rules on a column.
Report for correction

To enforce data integrity rules

To create a new table

To define an index on a column

To specify a default value for a column

21. What is the purpose of the UNIQUE constraint in DDL?

Explanation: The UNIQUE constraint is used to enforce uniqueness on a column, ensuring that all values in the column are distinct.
Report for correction

To enforce uniqueness on a column

To allow duplicate values in a column

To create a foreign key relationship

To add an index to a column

22. What is the purpose of the PRIMARY KEY constraint in DDL?

Explanation: The PRIMARY KEY constraint is used to ensure that each row in a table has a unique value in the specified column.
Report for correction

To ensure unique values in a column

To allow NULL values in a column

To create a foreign key relationship

To define the data type of a column

23. What is the purpose of the FOREIGN KEY constraint in DDL?

Explanation: The FOREIGN KEY constraint is used to create a relationship between two tables and ensure referential integrity.
Report for correction

To specify a default value for a column

To ensure referential integrity between tables

To create an index on a column

To define a unique constraint on a column

24. What is the purpose of the DEFAULT constraint in DDL?

Explanation: The DEFAULT constraint is used to specify a default value for a column.
Report for correction

To specify a default value for a column

To enforce data integrity rules

To create an index on a column

To add a new column to a table

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