Question: Database Administration In a sequence what is the difference between NEXTVAL and CURRVAL? How is CURRVAL used, and what is its purpose? What exceptions should

Database Administration

In a sequence what is the difference between NEXTVAL and CURRVAL? How is CURRVAL used, and what is its purpose?

What exceptions should be trapped for an Update procedure?

Oracle also supports a MERGE command. What does this do, and how is it different from this week's Insert/Update procedure?

What is the purpose of an INSTEAD OF trigger?

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