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PL/SQL Interview Questions and Answers

Explain two virtual tables available at the time of database trigger execution.

Table columns are referred as THEN.column_name and NOW.column_name.
For INSERT related triggers, NOW.column_name values are available only.
For DELETE related triggers, THEN.column_name values are available only.
For UPDATE related triggers, both Table columns are available.

How exception is different from error?

Whenever an Error occurs Exception arises. Error is a bug whereas exception is a warning or error condition.

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