Question: What is a relational database? How is it structured? What is a primary and foreign key? What is an index column in a table used

  1. What is a relational database? How is it structured?
  2. What is a primary and foreign key?
  3. What is an index column in a table used for?
  4. Why can't a primary key have a null value or duplicate value?
  5. What is SQL and what is it used for?
  6. What is the difference between OLAP and OLTP

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