下圖展示了 LEFT JOIN、RIGHT JOIN、INNER JOIN、OUTER JOIN 相關的 7 種用法。
具體分解如下：
1、INNER JOIN（内連接）
SELECT <select_list> FROM Table_A A INNER JOIN Table_B B ON A.Key = B.Key
2、LEFT JOIN（左連接）
SELECT <select_list> FROM Table_A A LEFT JOIN Table_B B ON A.Key = B.Key
3、RIGHT JOIN（右連接）
SELECT <select_list> FROM Table_A A RIGHT JOIN Table_B B ON A.Key = B.Key
4、OUTER JOIN（外連接）
SELECT <select_list> FROM Table_A A FULL OUTER JOIN Table_B B ON A.Key = B.Key
5、LEFT JOIN EXCLUDING INNER JOIN（左連接-内連接）
SELECT <select_list> FROM Table_A A LEFT JOIN Table_B B ON A.Key = B.Key WHERE B.Key IS NULL
6.RIGHT JOIN EXCLUDING INNER JOIN（右連接-内連接）
SELECT <select_list> FROM Table_A A RIGHT JOIN Table_B B ON A.Key = B.Key WHERE A.Key IS NULL
7、OUTER JOIN EXCLUDING INNER JOIN（外連接-内連接）
SELECT <select_list> FROM Table_A A FULL OUTER JOIN Table_B B ON A.Key = B.Key WHERE A.Key IS NULL OR B.Key IS NULL
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