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From "Bryan Pendleton (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2374) UNION PROBLEM WITH PARENTHESIS
Date Thu, 05 Nov 2009 19:16:32 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12774036#action_12774036
] 

Bryan Pendleton commented on DERBY-2374:
----------------------------------------

Thanks for doing the research Mamta, and for posting the information. It was very interesting
to read.

I think we should (incrementally) work to make our grammar match the SQL standard grammar.


> UNION PROBLEM WITH PARENTHESIS
> ------------------------------
>
>                 Key: DERBY-2374
>                 URL: https://issues.apache.org/jira/browse/DERBY-2374
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.1.3.3, 10.2.2.0, 10.3.3.1, 10.4.2.1, 10.5.3.1, 10.6.0.0
>            Reporter: Kenneth Gee
>            Priority: Minor
>         Attachments: DERBY2374_UnionWithParentheseOnLeftRS_diff_patch1.txt
>
>
> The following query shows the error using the Derby demo toursDB:
> SELECT FLIGHT_ID , SEGMENT_NUMBER , ARRIVE_TIME
>   FROM (
>          (SELECT HW.FLIGHT_ID , HW.SEGMENT_NUMBER , HW.ARRIVE_TIME FROM FLIGHTS HW)
>            UNION
>          (SELECT SW.FLIGHT_ID , SW.SEGMENT_NUMBER , SW.ARRIVE_TIME FROM FLIGHTS SW)
>        ) SRC;
> ERROR 42X01: Syntax error: Encountered "UNION" at line 4, column 12.
> The following query works:
> SELECT FLIGHT_ID , SEGMENT_NUMBER , ARRIVE_TIME
>   FROM (
>          SELECT HW.FLIGHT_ID , HW.SEGMENT_NUMBER , HW.ARRIVE_TIME FROM FLIGHTS HW
>           UNION
>          SELECT SW.FLIGHT_ID , SW.SEGMENT_NUMBER , SW.ARRIVE_TIME FROM FLIGHTS SW
>        )  SRC;

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