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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2374) UNION PROBLEM WITH PARENTHESIS
Date Fri, 23 Oct 2009 22:53:59 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12769516#action_12769516
] 

Knut Anders Hatlen commented on DERBY-2374:
-------------------------------------------

Mamta: Yes, that's what I was trying to say. But looking at the grammar in the standard again,
I think the associativity is the same (they are all left-associative), it's the operator precedence
that's different. INTERSECT has higher precedence than UNION and EXCEPT. And it looks like
Derby's grammar does have a separate rule for INTERSECT, so I guess it's probably fine.

> 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
>
> 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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