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https://issues.apache.org/jira/browse/DERBY-2374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12769516#action_12769516
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Knut Anders Hatlen commented on DERBY-2374:
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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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