jiangML commented on PR #18681:
URL: https://github.com/apache/shardingsphere/pull/18681#issuecomment-1172352035

      The select syntax is explained on pages 345, 347, and 350 of oracle's 
official documentation 
https://download.oracle.com/otn_hosted_doc/timesten/703/TimesTen-Documentation/sql.pdf.
   Oracle column aliases support AS, table aliases do not support AS.
   
   
![1656643054798](https://user-images.githubusercontent.com/16010265/176904100-1e8c09b3-9eb9-413e-acf5-97086b7eebe8.jpg)
   
   
   
![1656643211436](https://user-images.githubusercontent.com/16010265/176904125-30fb7c1a-6d33-4336-b07c-1917bdb4772f.jpg)
   
   
   
   
![1656642902777](https://user-images.githubusercontent.com/16010265/176904142-0a8f2743-a3ee-40c9-b9ce-27b9409bc847.jpg)
   
   


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