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Explain the importance of joins in SQL? How two or more tables can be joined? Define different types of join SQL. Write difference between Left

Explain the importance of joins in SQL?  

  1. How two or more tables can be joined? 
  2. Define different types of join SQL. 
  3. Write difference between Left outer join and right outer join using a query examples.
  4. Write difference between following : Where and having clauses? Joins and Sub Query

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1 The SQL Joins clause is used to ... blur-text-image

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