SQL中Join如何使用

这篇文章给大家介绍SQL中Join如何使用，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。

1、INNER JOIN(内连接)

SELECT FROM Table_A AINNER JOIN Table_B BON A.Key = B.Key

2、LEFT JOIN(左连接)

SELECT FROM Table_A ALEFT JOIN Table_B BON A.Key = B.Key

3、RIGHT JOIN(右连接)

SELECT FROM Table_A ARIGHT JOIN Table_B BON A.Key = B.Key

4、OUTER JOIN(外连接)

SELECT FROM Table_A AFULL OUTER JOIN Table_B BON A.Key = B.Key

5、LEFT JOIN EXCLUDING INNER JOIN(左连接-内连接)

SELECT FROM Table_A ALEFT JOIN Table_B BON A.Key = B.KeyWHERE B.Key IS NULL

6.RIGHT JOIN EXCLUDING INNER JOIN(右连接-内连接)

SELECT FROM Table_A ARIGHT JOIN Table_B BON A.Key = B.KeyWHERE A.Key IS NULL

7、OUTER JOIN EXCLUDING INNER JOIN(外连接-内连接)

SELECT FROM Table_A AFULL OUTER JOIN Table_B BON A.Key = B.KeyWHERE A.Key IS NULL OR B.Key IS NULL

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