ORACLE Develop Rule

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Rule:
1. Try to use one SQL script to accomplish the task.
2. If one SQL script can't solve the problem, try to use PL/SQL script.
3. If PL/SQL script can't solve the problem, try to use JAVA script.
4. If JAVA script can't solve the problem, try to use C script.
5. If C script can't solve the problem, try to think whether the problem need to be solved.

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