Handling Exceptions in PL/SQL
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Questions and Answers

What is an exception in PL/SQL?

  • A loop construct in PL/SQL
  • A variable declaration in PL/SQL
  • A successful completion of a program
  • A PL/SQL error raised during program execution (correct)

How can an exception be raised in PL/SQL?

  • By ending the program gracefully
  • Implicitly by the Oracle server (correct)
  • By initializing a loop
  • By declaring a variable

How can an exception be handled in PL/SQL?

  • By ignoring it completely
  • By propagating it to the calling environment
  • By trapping it with a handler (correct)
  • By raising another exception

What happens if an exception is not trapped in PL/SQL?

<p>The program will terminate abruptly (B)</p> Signup and view all the answers

Which of the following is NOT a named exception mentioned in the text?

<p>DATA_ERROR (A)</p> Signup and view all the answers

What does the 'WHEN others' clause signify in exception handling in PL/SQL?

<p>Specifying the last exception to be handled (A)</p> Signup and view all the answers

What is the purpose of an exception block in PL/SQL?

<p>To handle error conditions during program execution (C)</p> Signup and view all the answers

What are the two types of exceptions mentioned in the text?

<p>System-defined and User-defined (A)</p> Signup and view all the answers

What happens when an exception is encountered in PL/SQL?

<p>The program execution transfers to the exception block (C)</p> Signup and view all the answers

In the given PL/SQL example, what action is taken if 'TOO_MANY_ROWS' exception occurs?

<p>The program prints 'Your select statement retrieved multiple rows' (A)</p> Signup and view all the answers

What do System-defined Exceptions refer to in PL/SQL?

<p>Exceptions defined by the PL/SQL system (D)</p> Signup and view all the answers

What is the main function of handling exceptions in PL/SQL?

<p>To gracefully deal with errors during program execution (B)</p> Signup and view all the answers

What error is raised when a unique constraint is violated during an INSERT or UPDATE operation?

<p>DUP_VAL_ON_INDEX (B)</p> Signup and view all the answers

In the provided example code, what error is handled when attempting division by zero?

<p>ZERO_DIVIDE (D)</p> Signup and view all the answers

What action does the exception handler take when no data is found during the SELECT statement in the code snippet?

<p>Outputs 'No such customer!' (D)</p> Signup and view all the answers

What is the purpose of the EXCEPTION WHEN others statement in the code snippet?

<p>To handle any other unidentified exception (A)</p> Signup and view all the answers

What would be the output if 'c_id' in the code snippet is changed to 5?

<p>'Name: Sunita' and 'Address: Delhi' (B)</p> Signup and view all the answers

Which error message would be displayed if the SELECT statement in the code snippet fails for reasons other than no data found?

<p>'Error!' (D)</p> Signup and view all the answers

What keyword is used to explicitly raise an exception in PL/SQL code?

<p>RAISE (C)</p> Signup and view all the answers

In the provided PL/SQL code snippet, what action is taken when the total number of courses exceeds 3?

<p>The record insertion is cancelled and an exception is raised. (A)</p> Signup and view all the answers

What happens if 'crno' in the PL/SQL code snippet is equal to 3?

<p>Nothing, the program continues to execute normally. (B)</p> Signup and view all the answers

What is the purpose of the EXCEPTION block in the given PL/SQL program?

<p>To handle the NO_DATA_FOUND exception (A)</p> Signup and view all the answers

What would be the result if the user enters 'Amit' for the value of 'snm' in the PL/SQL code snippet?

<p>The value is accepted and stored in the database. (B)</p> Signup and view all the answers

What is the outcome if a customer with ID 8 exists in the customers table?

<p>The program will display the name and address of the customer (C)</p> Signup and view all the answers

What would be the output if the 'sno' value entered by the user in the PL/SQL code snippet is 10?

<p>'Roll number does not exist' error occurs. (A)</p> Signup and view all the answers

When is the user-defined exception typically used in PL/SQL programs?

<p>To handle specific cases where custom errors may occur (C)</p> Signup and view all the answers

Which block of code in the PL/SQL snippet is responsible for handling exceptions?

<p>'EXCEPTION' (B)</p> Signup and view all the answers

What does the following line in the code accomplish: 'SELECT name, address INTO c_name, c_addr FROM customers WHERE id = c_id;'?

<p>It initializes variables to store the name and address of a customer (B)</p> Signup and view all the answers

In case of an error not specified in the EXCEPTION block, what will happen in the program?

<p>The program will output 'Error!' (A)</p> Signup and view all the answers

What would be displayed if there was no exception raised during the execution of the given PL/SQL code?

<p>'Name: alex' and 'Address: paris' (D)</p> Signup and view all the answers

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