Generate 10 PLSQL programming exam questions with answers. Make it from different types.

Here are 10 PL/SQL questions with their answers, covering topics like blocks, cursors, exception handling, triggers, packages, and performance improvements.

1. What is PL/SQL?

   • Answer: PL/SQL stands for Procedural Language extensions to SQL. It is Oracle's procedural language extension to SQL.

2. Explain the main components of a PL/SQL block.

   • Answer: A PL/SQL block has a declarative part, execution part, and exception handling part.

3. What are the benefits of using PL/SQL?

   • Answer: Benefits include improved performance, portability, error handling, and language integration with SQL.

4. What are cursors in PL/SQL and its types?

   • Answer: Cursors are used to retrieve multiple rows from a database. Types: Implicit and Explicit.

5. Explain Exception Handling in PL/SQL.

   • Answer: Exception Handling allows you to handle errors gracefully and involves declaring and managing errors using TRY, EXCEPTION, and END blocks.

6. How are triggers used in PL/SQL?

   • Answer: Triggers automatically execute a specified block of code in reaction to certain events on a particular table or view.

7. What is the difference between Function and Procedure in PL/SQL?

   • Answer: Functions must return a value using the RETURN statement, procedures do not return a value but can pass values via OUT parameters.

8. What is a Package in PL/SQL?

   • Answer: A package is a schema object that groups logically related PL/SQL types, variables, procedures, and functions.

9. How can you improve the performance of a PL/SQL application?

   • Answer: Use bulk binding, minimize context switching, use efficient SQL queries, and optimize PL/SQL logic.

10. Describe Mutating and Constraining errors in PL/SQL.

    • Answer: Mutating errors occur when a trigger tries to query or modify a table already in use, while constraining errors relate to constraint validation errors.