Exception handling and custom exception
Exception handling is an essential aspect of programming, and it allows you to handle errors and unexpected events that can occur during program execution. In PL/SQL, exception handling is achieved using the EXCEPTION keyword, which is used to define a block of code that will handle errors when they occur.
When an exception is raised, PL/SQL searches for an appropriate exception handler. If a matching handler is found, the code within the handler is executed to handle the exception. If no handler is found, the program will terminate with an error message.
Custom exceptions, on the other hand, are exceptions that you define yourself to represent specific error conditions that may not be covered by the standard exceptions provided by PL/SQL. Custom exceptions can be raised using the RAISE keyword, and they can be caught using an exception handler.
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