Left Join

  1. Using a left join, write a SQL query that returns all columns and rows from a tabled called “Employee”, and any matching rows in a table called “Phone”, where the phone table has a column called “EmployeeID” that is a foreign key to a column called “EmployeeID” in the employee table (do not use table aliases, e.g., “Phone AS p”):
    1. SELECT * FROM Employee LEFT JOIN Phone ON Phone.EmployeeID = Employee.EmployeeID
    2. SELECT * FROM Employee LEFT JOIN Phone ON Employee.EmployeeID = Phone.EmployeeID
      1. Any of the above are correct
  2. When using a left join, if there is not a matching row in the right table, what is returned for the unmatched columns in the right table? (a word that means the absence of value)
    1. NULL


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