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  1. Derby
  2. DERBY-3373

SQL "distinct" and "order by" needed together

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Blocker
    • Resolution: Fixed
    • Affects Version/s: 10.3.2.1
    • Fix Version/s: 10.3.3.0, 10.4.1.3, 10.5.1.1
    • Component/s: SQL
    • Labels:
      None
    • Environment:
      Solaris Dev Express, Java 5
    • Urgency:
      Blocker
    • Bug behavior facts:
      Regression

      Description

      I am pasting here the communication from the mailinglist. I am having a blocking and large problem with it because I have to make a release that needs the specified SQL query.

      tom_ wrote:

      > The errormessage is
      >
      > The ORDER BY clause may not specify an expression, since the query specifies
      > DISTINCT
      > [Error Code: 20000]
      > [SQL State: 4287A]
      >
      > The statement is
      >
      > select distinct
      > t1.t1_id, t2.t2value1, t2.t2value2, t2.t2value3
      > from
      > t1, t2, t3
      > where
      > ...
      > order by lower(t2.t2value2) , lower(t2.t2value1) , lower(t2.t2value3)
      >
      >
      >
      >
      > Dyre.Tjeldvoll wrote:
      >
      >> tom_ <tom12167@...> writes:
      >>
      >>
      >>> I am using "disctinct" because of some self-joins and also needed to add
      >>> an
      >>> "order by" clause. An error is shown. Is it not possible to use distinct
      >>> and
      >>> order by together?
      >>>
      >> I think it is allowed. Executing
      >>
      >> select distinct * from sys.systables order by tablename;
      >>
      >> in ij works just fine. Could you show the error message you get, and
      >> perhaps what the table looks like?
      >>
      >> –
      >> dt
      >>
      >>
      >>
      « [hide part of quote]

      Hi Tom -

      I see what you mean using the demo DB toursDB:

      ij> select * from airlines order by lower(airline_full);
      A&|AIRLINE_FULL |BASIC_RATE |DISTANCE_DISCOUNT

      BUSINESS_LEVEL_FACTOR
      FIRSTCLASS_LEVEL_FACT& ECONOMY_SE& BUSINESS_S& FIRSTCLASS&
      -----------------------------------------------------------------------------------------------------------------------------------------------------------
      AA
      Amazonian Airways 0.18 0.03
      0.5 1.5 20 10 5
      US
      Union Standard Airlines 0.19 0.05
      0.4 1.6 20 10 5

      2 rows selected
      ij> select distinct * from airlines order by lower(airline_full);
      ERROR 4287A: The ORDER BY clause may not specify an expression, since
      the query specifies DISTINCT.
      ij> select distinct airline_full from airlines order by lower(airline_full);
      ERROR 4287A: The ORDER BY clause may not specify an expression, since
      the query specifies DISTINCT.
      ij>

      I didn't find a JIRA enhancement to remove this restriction. I suggest
      you file an Enhancement request to remove the restriction reported by
      ERROR 4287A.

        Attachments

        1. allowExpressions.diff
          6 kB
          Bryan Pendleton
        2. mergeWith2351.diff
          6 kB
          Bryan Pendleton

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              • Assignee:
                bryanpendleton Bryan Pendleton
                Reporter:
                tom_ Thomas Vatter
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                Dates

                • Created:
                  Updated:
                  Resolved: