比较两个相同的表并检索差异行

Question

有没有办法比较两个相同的表并在Informix DB中检索差异行？

请考虑以下表格，其中 ID 是主键。

TABLE A     

ID    NAME    EMAIL               PROFILE
a1    ABC     ABC@ymail.com       student  
a2    XYZ     XYZ@gmail.com       student
a3    LMN     LMN@gmail.com       Staff

TABLE B

ID    NAME    EMAIL               PROFILE
a1    ABC     ABC@ymail.com       student
a2    XYZ     XYZ@gmail.com       student
a3    LMN     LMN@ymail.com       student

请帮我构建SQL以从表A中检索与表B不匹配的行。

OUTPUT应为：

ID    NAME    EMAIL               PROFILE
a3    LMN     LMN@gmail.com       Staff

Answer 1

SELECT  *
FROM    TABLE_A 
            LEFT JOIN TABLE_B   
                ON TABLE_A.ID = TABLE_B.ID
                    AND TABLE_A.[NAME] = TABLE_B.[NAME]
                    AND TABLE_A.EMAIL = TABLE_B.ID
                    AND TABLE_A.[PROFILE] = TABLE_B.[PROFILE]
WHERE   TABLE_B.[NAME] IS NULL