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From "Mamta A. Satoor (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2374) UNION PROBLEM WITH PARENTHESIS
Date Fri, 23 Oct 2009 20:49:59 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12769436#action_12769436
] 

Mamta A. Satoor commented on DERBY-2374:
----------------------------------------

Dag, thanks for providing how the query in question is SQL-supported by walking through different
derivatives. I had gone through the spec myself yesterday to make sure that what this jira
wants is indeed SQL-compatible,

Knut, it is interesting that INTERSECT does not work same as EXCEPT associativity wise. I
thought the work to support both of them in Derby went in as one big checkin and so I assumed
that parser behavior would be the same for both of them.

> 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: 10.2.2.0
>            Reporter: Kenneth Gee
>            Priority: Minor
>
> 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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