Mastering SQL JOIN and Inner Join
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Questions and Answers

What is a SQL JOIN clause used for?

  • To combine rows from two or more tables based on a related column between them (correct)
  • To update rows from two or more tables based on a related column between them
  • To delete rows from two or more tables based on a related column between them
  • To insert rows into two or more tables based on a related column between them

    • What is the relationship between the 'CustomerID' columns in the 'Orders' and 'Customers' tables?

  • The 'CustomerID' column in the 'Orders' table refers to the 'CustomerID' in the 'Customers' table (correct)
  • The 'CustomerID' column in the 'Orders' table and the 'CustomerID' column in the 'Customers' table are unrelated
  • The 'CustomerID' column in the 'Customers' table refers to the 'CustomerID' in the 'Orders' table
  • The 'CustomerID' column in the 'Orders' table and the 'CustomerID' column in the 'Customers' table are the same column

    • What does a SQL inner join do?

  • Excludes rows from the tables where the join conditions are satisfied
  • Returns all rows from both tables
  • Returns only the rows from the first table
  • Includes rows from the tables where the join conditions are satisfied (correct)

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