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Date: Fri, 3 Feb 2012 15:27:53 +0000 (UTC)
From: "Dag H. Wanvik (Commented) (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
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Subject: [jira] [Commented] (DERBY-5584) Select statement with subqueries
 with group by and count distinct statements returns wrong number of results
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    [ https://issues.apache.org/jira/browse/DERBY-5584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13199769#comment-13199769 ] 

Dag H. Wanvik commented on DERBY-5584:
--------------------------------------

I tested it on this data set with a similar nested query and it seems to work ok:

SELECT * FROM (SELECT ps1.group_ref, ps1.profile_id FROM test_5 ps1 ORDER BY profile_id) a, (SELECT ps2.group_ref, ps2.profile_id FROM test_6 ps2 ORDER BY PROFILE_ID) b ;

GROUP_REF  |PROFILE_ID |GROUP_REF  |PROFILE_ID 
-----------------------------------------------
10000      |1          |10000      |1          
10000      |1          |10000      |1          
10000      |1          |10000      |2          
10000      |1          |10000      |2          
10000      |1          |10000      |2          
10000      |1          |10000      |3 
etc.

                
> Select statement with subqueries with group by and count distinct statements returns wrong number of results
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-5584
>                 URL: https://issues.apache.org/jira/browse/DERBY-5584
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Server
>    Affects Versions: 10.7.1.1
>         Environment: Output from sysinfo
> java.specification.name: Java Platform API Specification
> java.specification.version: 1.6
> java.runtime.version: 1.6.0_20-b02
> --------- Derby Information --------
> JRE - JDBC: Java SE 6 - JDBC 4.0
> [/home/piotrz/Desktop/db-derby-10.7.1.1-bin/lib/derby.jar] 10.7.1.1 - (1040133)
> [/home/piotrz/Desktop/db-derby-10.7.1.1-bin/lib/derbytools.jar] 10.7.1.1 - (1040133)
> [/home/piotrz/Desktop/db-derby-10.7.1.1-bin/lib/derbynet.jar] 10.7.1.1 - (1040133)
> [/home/piotrz/Desktop/db-derby-10.7.1.1-bin/lib/derbyclient.jar] 10.7.1.1 - (1040133)
> ------------------------------------------------------
> ----------------- Locale Information -----------------
> Current Locale :  [English/United States [en_US]]
> Found support for locale: [cs]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [de_DE]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [es]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [fr]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [hu]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [it]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [ja_JP]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [ko_KR]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [pl]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [pt_BR]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [ru]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [zh_CN]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [zh_TW]
> 	 version: 10.7.1.1 - (1040133)
>            Reporter: Piotr Zgadzaj
>            Assignee: Bryan Pendleton
>         Attachments: patch1.txt, query.log, tests.out, tests.sql, try1.txt
>
>
> Steps to reproduce:
> 1. Create database, connect to database with any JDBC client
> 2. create two tables:
> CREATE TABLE TEST_5 (
>        profile_id INTEGER NOT NULL,
>        group_ref INTEGER NOT NULL,
>        matched_count INTEGER NOT NULL
>    );
>    CREATE TABLE TEST_6 (
>        profile_id INTEGER NOT NULL,
>        group_ref INTEGER NOT NULL,
>        matched_count INTEGER NOT NULL
>    );
> 3. Insert two records for each table:
> insert into test_5 values (1, 10000,1);
> insert into test_5 values (2, 10000, 2);
> insert into test_6 values (1, 10000,1);
> insert into test_6 values (2, 10000, 2);
> 4. Run following statement
> SELECT *
> FROM
>  (SELECT ps1.group_ref,
>    COUNT(DISTINCT ps1.matched_count) AS matched_count
>  FROM test_5 ps1
>  GROUP BY ps1.group_ref,
>    ps1.profile_id
>  ) a,
>  (SELECT ps2.group_ref,
>    COUNT( DISTINCT ps2.matched_count) AS matched_count
>  FROM test_6 ps2
>  GROUP BY ps2.group_ref,
>    ps2.profile_id
>  ) b
> As a result I've got 3 records instead of 4 - at least Oracle 10g
> returns 4 records for this statement. Maybe i'm doing something wrong.
> Do you have any suggestions / possible workarounds for this problem

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