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Types of keys in data tables?

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How many types of keys are there in data tables?

Content (please ensure you mask any confidential information):

Hi Team,

I have some queries.

  1. How many keys are there in data tables? And what are those?
  2. I want to join two data tables so what are the parametes do I need to check?
  3. If you take any data table in docs.oracle what is the difference between "Columns" and "Indexes"

Please some one will help me to understand these basic and importent points to build my technical stuff.



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