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24 uniquely designed questions just for you to evaluate your skills in SQL Data Definition Language (DDL) quiz. Are you ready to challenge yourself and explore more? Let's get started and see how much you can score out of 24.

Test your knowledge of SQL Data Definition Language (DDL) with 25 multiple-choice questions. Learn about creating tables, constraints, and more

Please feel free to report any corrections if you come across any inaccuracies or errors. Your feedback is valuable in maintaining the accuracy of our content.

Questions

1. What does DDL stand for in SQL?
Answer: Data Definition Language
Explanation: DDL is used to define the structure of a database, including tables, constraints, and relationships.Report for correction
2. Which DDL statement is used to create a new table?
Answer: CREATE TABLE
Explanation: The CREATE TABLE statement is used to create a new table in a database.Report for correction
3. Which DDL statement is used to add a new column to an existing table?
Answer: ADD COLUMN
Explanation: The ADD COLUMN statement is used to add a new column to an existing table.Report for correction
4. What is the purpose of the ALTER TABLE statement in DDL?
Answer: To modify an existing table
Explanation: The ALTER TABLE statement is used to modify the structure of an existing table.Report for correction
5. Which DDL statement is used to delete a table from a database?
Answer: DROP TABLE
Explanation: The DROP TABLE statement is used to delete a table from a database.Report for correction
6. What is the purpose of the PRIMARY KEY constraint in DDL?
Answer: To ensure unique values in a column
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
7. Which DDL statement is used to remove a PRIMARY KEY constraint from a table?
Answer: DROP PRIMARY KEY
Explanation: The DROP PRIMARY KEY statement is used to remove a PRIMARY KEY constraint from a table.Report for correction
8. Which DDL statement is used to create a unique constraint on a column?
Answer: ADD CONSTRAINT
Explanation: The ADD CONSTRAINT statement is used to create a unique constraint on a column.Report for correction
9. What is the purpose of the FOREIGN KEY constraint in DDL?
Answer: To ensure referential integrity between tables
Explanation: The FOREIGN KEY constraint is used to create a relationship between two tables and ensure referential integrity.Report for correction
10. Which DDL statement is used to remove a FOREIGN KEY constraint from a table?
Answer: DROP FOREIGN KEY
Explanation: The DROP FOREIGN KEY statement is used to remove a FOREIGN KEY constraint from a table.Report for correction
11. Which DDL statement is used to change the data type of a column in an existing table?
Answer: ALTER COLUMN
Explanation: ALTER COLUMN statements are used to change the data type of a column in an existing table.Report for correction
12. What is the purpose of the CHECK constraint in DDL?
Answer: To enforce data integrity rules
Explanation: The CHECK constraint is used to enforce data integrity rules on a column.Report for correction
13. Which DDL statement is used to add a default value to a column?
Answer: SET DEFAULT
Explanation: The SET DEFAULT statement is used to add a default value to a column.Report for correction
14. What is the purpose of the INDEX keyword in DDL?
Answer: To define an index on one or more columns
Explanation: The INDEX keyword is used to define an index on one or more columns in a table.Report for correction
15. Which DDL statement is used to rename a table?
Answer: RENAME TABLE
Explanation: The RENAME TABLE statement is used to rename a table in DDL.Report for correction
16. What is the purpose of the VIEW keyword in DDL?
Answer: To define a virtual table based on a query
Explanation: The VIEW keyword is used to define a virtual table based on the result of a query.Report for correction
17. Which DDL statement is used to remove a view?
Answer: DROP VIEW
Explanation: The DROP VIEW statement is used to remove a view.Report for correction
18. What is the purpose of the TRUNCATE TABLE statement in DDL?
Answer: To remove all rows from a table
Explanation: The TRUNCATE TABLE statement is used to remove all rows from a table while keeping the table structure intact.Report for correction
19. Which DDL statement is used to add a new constraint to an existing table?
Answer: ADD CONSTRAINT
Explanation: The ADD CONSTRAINT statement is used to add a new constraint to an existing table.Report for correction
20. What is the purpose of the UNIQUE constraint in DDL?
Answer: To enforce uniqueness on a column
Explanation: The UNIQUE constraint is used to enforce uniqueness on a column, ensuring that all values in the column are distinct.Report for correction
21. Which DDL statement is used to remove a UNIQUE constraint from a column?
Answer: DROP UNIQUE
Explanation: The DROP UNIQUE statement is used to remove a UNIQUE constraint from a column.Report for correction
22. What is the purpose of the DEFAULT constraint in DDL?
Answer: To specify a default value for a column
Explanation: The DEFAULT constraint is used to specify a default value for a column.Report for correction
23. Which DDL statement is used to modify the name of a column in an existing table?
Answer: RENAME COLUMN
Explanation: The RENAME COLUMN statement is used to modify the name of a column in an existing table.Report for correction
24. What does the CASCADE option do when removing a foreign key constraint in DDL?
Answer: It drops all dependent tables.
Explanation: The CASCADE option, when used with the removal of a foreign key constraint, will drop all dependent tables.Report for correction