原文:http://www.codeproject.com/Articles/33052/Visual-Representation-of-SQL-Joins
 
从视图上介绍了7种不同类型的JOIN操作:
  1. INNER JOIN
  2. LEFT JOIN
  3. RIGHT JOIN
  4. OUTER JOIN
  5. LEFT JOIN EXCLUDING INNER JOIN
  6. RIGHT JOIN EXCLUDING INNER JOIN
  7. OUTER JOIN EXCLUDING INNER JOIN
 
 

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