In PL/SQL, a warning or error condition is called an exception. Exceptions can be internally defined (by the run-time system) or user defined. Examples of internally defined exceptions include division by zero and out of memory. Some common internal exceptions have predefined names, such as ZERO_DIVIDE and STORAGE_ERROR.
Handling Exceptions Raised in Declarations. Exceptions can be raised in declarations by faulty initialization expressions. For example, the following declaration raises an exception because the constant credit_limit cannot store numbers larger than 999:. DECLARE credit_limit CONSTANT NUMBER(3) := 5000; — raises an exception BEGIN NULL; EXCEPTION WHEN OTHERS THEN –.
9/16/2020 · Defining Your Own PL /SQL Exceptions PL /SQL lets you define exceptions of your own. Unlike predefined exceptions, user-defined exceptions must be declared and must be raised explicitly by RAISE statements. Declaring PL /SQL Exceptions Exceptions can be declared only in the declarative part of a PL /SQL block, subprogram, or package.
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4/28/2018 · EXCEPTION WHEN exception1 THEN statement1; WHEN exception2 THEN statement2; [WHEN others THEN] /* default exception handling code */ END; Note: When other keyword should be used only at the end of the exception handling block as no exception handling part present later will get executed as the control will exit from the block after executing the WHEN OTHERS.
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