Answer / tulsi

Exception is the error handling part of PL/SQL block. The
types are Predefined and user_defined. Some of Predefined
execptions are.
CURSOR_ALREADY_OPEN
DUP_VAL_ON_INDEX
NO_DATA_FOUND
TOO_MANY_ROWS
INVALID_CURSOR
INVALID_NUMBER
LOGON_DENIED
NOT_LOGGED_ON
PROGRAM-ERROR
STORAGE_ERROR
TIMEOUT_ON_RESOURCE
VALUE_ERROR
ZERO_DIVIDE
OTHERS.

Answer / chintu

Any ubnormal event in a program is called Exception.
In pl/ sql there are two types of exceptions they are
Userdefind Exception and predefined Exceptions.
Predefined exceptions are
CURSOR_ALREADY_OPEN
DUP_VAL_ON_INDEX
NO_DATA_FOUND
TOO_MANY_ROWS
INVALID_CURSOR
INVALID_NUMBER
LOGON_DENIED
NOT_LOGGED_ON
PROGRAM-ERROR
STORAGE_ERROR
TIMEOUT_ON_RESOURCE
VALUE_ERROR
ZERO_DIVIDE
OTHERS.
user defined exceptions are defined by raise_application_
error("error msg","error number") and
pragma_exception_init()

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