Stored Procedures Quiz - Languages SQL

Free practice quiz: Stored Procedures (Languages SQL). 49 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This Languages SQL practice quiz has 49 multiple-choice questions on Stored Procedures, and 49 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which keyword is used to define a stored procedure in SQL?

   1. CREATE PROCEDURE
   2. DEFINE PROCEDURE
   3. MAKE PROCEDURE
   4. INSERT PROCEDURE
   Show answer

   Answer: A. CREATE PROCEDURE

   The `CREATE PROCEDURE` statement is the standard SQL syntax for defining a stored procedure.

2. What is the difference between a stored procedure and a function in SQL?

   1. Functions can only return single scalar values, procedures can return multiple values or result sets
   2. Procedures cannot accept parameters, functions can
   3. Functions are compiled, procedures are not
   4. Procedures are always faster than functions
   Show answer

   Answer: A. Functions can only return single scalar values, procedures can return multiple values or result sets

   While there are nuances across different SQL dialects, a common distinction is that SQL functions are designed to return a single scalar value (or a table in some dialects), whereas stored procedures can return multiple result sets, output parameters, and have more control flow.

3. What does it mean for a stored procedure to be 'idempotent'?

   1. It can only be executed once
   2. Executing it multiple times with the same input produces the same result and state change
   3. It always returns a different result
   4. It requires specific hardware to run
   Show answer

   Answer: B. Executing it multiple times with the same input produces the same result and state change

   An idempotent operation is one that can be applied multiple times without changing the result beyond the initial application. This is a desirable property for procedures that modify data.

4. What is a 'cursor' in the context of stored procedures?

   1. A statement that returns a result set
   2. A mechanism to iterate through rows of a result set one by one
   3. A type of stored procedure parameter
   4. A temporary storage area for data
   Show answer

   Answer: B. A mechanism to iterate through rows of a result set one by one

   Cursors allow for row-by-row processing of data returned by a query within a stored procedure, though they are generally less efficient than set-based operations.

5. What is a common stored procedure used for managing permissions or executing administrative tasks?

   1. `SELECT * FROM SomeTable`
   2. `EXEC sp_configure` (SQL Server)
   3. `INSERT INTO LogTable`
   4. `CREATE TABLE TemporaryData`
   Show answer

   Answer: B. `EXEC sp_configure` (SQL Server)

   System stored procedures, like `sp_configure` in SQL Server, are often used for administrative and configuration tasks. Note that system procedure names and availability vary by RDBMS.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What is the primary benefit of using stored procedures?
2. How can you pass values into a stored procedure?
3. Which keyword is used to return a value from a stored procedure?
4. What is an 'output parameter' in the context of stored procedures?
5. Which of the following is NOT a valid reason to use stored procedures?
6. Consider a stored procedure that inserts a new record into an 'employees' table. What would be a typical input parameter?
7. What happens if a stored procedure encounters an unhandled error?
8. How can you modify an existing stored procedure?
9. What is the purpose of the `EXEC` or `EXECUTE` keyword?
10. Which of the following is a common characteristic of stored procedures for performance optimization?
11. What is a 'result set' returned by a stored procedure?
12. How can you handle potential SQL injection vulnerabilities when using stored procedures?
13. What is the purpose of a `TRANSACTION` within a stored procedure?
14. Which of the following is a typical use case for stored procedures?
15. How are variables declared within a stored procedure in many SQL dialects?
16. What is the role of a stored procedure in database security?
17. What is the difference between `DROP PROCEDURE` and `ALTER PROCEDURE`?
18. Which SQL statement is typically used to assign a value to a variable within a stored procedure?
19. What is the primary advantage of storing business logic in stored procedures?
20. How can a stored procedure return a table of data?
21. What is a 'parameterized query' in the context of stored procedures?
22. What is the purpose of `BEGIN` and `END` blocks in a stored procedure?
23. Which of the following is a potential disadvantage of using stored procedures?
24. How can you conditionally execute statements within a stored procedure?
25. What is a 'table-valued parameter' in some SQL implementations?
26. What is the primary function of the `GETDATE()` or `NOW()` function in a stored procedure?
27. What is the primary purpose of a `WHILE` loop in a stored procedure?
28. How can you dynamically execute SQL statements within a stored procedure?
29. What is the best practice for naming stored procedures?
30. Which statement is used to signal the end of a stored procedure's execution and optionally return a status code?
31. What is the role of the `USE` statement within some stored procedures?
32. What is a common way to implement error handling within a stored procedure?
33. Which of the following best describes the encapsulation provided by stored procedures?
34. What is the purpose of `PRINT` or `RAISERROR` within a stored procedure?
35. In a stored procedure, how can you pass a value back to the calling application that is not part of a result set?
36. What does the `GO` statement (in SQL Server Management Studio context) typically do in relation to stored procedures?
37. When is it generally more efficient to use a stored procedure rather than sending a long SQL query from an application?
38. What is a common way to handle multiple `SELECT` statements within a single stored procedure?
39. What is the role of a `COMMIT` statement within a stored procedure that modifies data?
40. Consider a stored procedure that needs to dynamically build a `WHERE` clause based on optional parameters. What is a key consideration?
41. What is the primary function of a `ROLLBACK` statement within a stored procedure?
42. Which SQL statement is used to remove an existing stored procedure?
43. What is a common scenario where a stored procedure might return an error code?
44. What is the purpose of the `IF EXISTS` clause when creating a stored procedure?

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