Oracle: Use LEFT OUTER JOIN, but convert the data to an external list

Hello, all,.

I know it can be done; I just don't remember how I got it done, oh there are so many years.

Assumes that the tables exist for groups and individuals.  People can belong to several groups.

SELECT g.groupName, p.lastName || ', ' || p.firstName as fullName
FROM groups g LEFT OUTER JOIN groupPersonAssociation gpa ON gpa.groupID = g.groupID
              LEFT OUTER JOIN person p ON p.personID = gpa.personID
ORDER BY g.groupName, fullName

This gives us:

Group One          Alpha, Daniel
Group One          Bravo, Charles
Group One          Charlie, Chuck
Group Two          Beta, Alpha
Group Two          Delta, Bonnie
Group Three        Echo, Bunny
Group Three        Golf, Samuel
Group Three        November, Stan

How word the SQL to get the data as:

Group One          Alpha, Daniel | Bravo, Charles | Charlie, Chuck
Group Two          Beta, Alpha | Delta, Bonnie
Group Three        Echo, Bunny | Golf, Samuel | November, Stan

V/r,

^_^

I finally thought to it.  I was using incorrect keywords on Google.

SELECT g.groupName, LISTAGG(p.lastName || ', ' || p.firstName,' | ') WITHIN GROUP (ORDER BY g.groupName) "fullName"
FROM groups g LEFT OUTER JOIN groupPersonAssociation gpa ON ggpa.groupID = g.groupID
              LEFT OUTER JOIN person p ON p.personID = gpa.personID
GROUP BY g.groupName
ORDER BY g.groupName, fullName

Just in case someone else is going through this same desire.

HTH,

^_^

Tags: ColdFusion

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    Select count (*) view_a, view_b

    where view_a.col1 = view_b.col1 (+)

    and view_a.col2 = view_b.col2 (+);

    Which is not necessarily related to the use of an outer join.

    Just join of two tables in general will give you more rows of one table has.

    Scott DEPT table contains ONE row for deptno = 10

    The EMP table has THREE rows of deptno = 10

    The number of rows you plan if you join two tables using an equi-join?

    Three - what is MORE lines the DEPT table has for deptno = 10

    Select * from Department where deptno = 10

    DEPTNO, DNAME, LOC
    10, ACCOUNTING, NEW YORK

    Select * from emp where deptno = 10

    MGR, EMPLOYMENT ENAME, EMPNO, HIREDATE, SAL, COMM, DEPTNO
    7782, CLARK, MANAGER, 7839, 6/9/1981,2450, 10
    7839, KING, PRESIDENT, 17 NOVEMBER 00, 10
    7934, MILLER, CLERK, 7782, 23 JANUARY 00: 10

    Select dept.*, emp.*
    Department, emp
    where dept.deptno = 10
    and dept.deptno = emp.deptno

    DEPTNO, DNAME, LOC, EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO_1
    10, ACCOUNTING, NEW YORK, 7782, CLARK, MANAGER, 7839, 6/9/1981,2450, 10
    10, ACCOUNTING, NEW YORK, 7839, KING, PRESIDENT, 17 NOVEMBER 00, 10
    10, ACCOUNTING, NEW YORK, 7934, MILLER, CLERK, 7782, 23 JANUARY 00: 10

    So if these are the lines ONLY in the table EMP and DEPT the query would give you THREE lines despite the DEPT table only ONE line.

    No do you expect? You get ALL the child rows that belong to the parent company. Otherwise, how could it possibly work?

    The OUTER join includes lines where the parent row exists but there is NO child line as others have shown.

    Outer joins

    Outer join extends the result of a simple join. Outer join returns all rows that satisfy the join condition and also returns some or all rows in a table for which no line of the other meet the join condition.

    Get more lines to exist in one of the paintings is a basic necessity. It usually has NOTHING to with the question of whether you have an outside to join or not.

    See the section on the JOINTS in the Oracle documentation

    http://docs.Oracle.com/CD/B28359_01/server.111/b28286/queries006.htm

  • Problem with XMLTABLE and LEFT OUTER JOIN

    Hi all.

    I have a problem with XMLTABLE and LEFT OUTER JOIN, in 11g it returns the correct result, but in 10g it doesn't, it is illustrated as a INNER JOIN.
    SELECT * FROM v$version;

Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
"CORE     11.2.0.1.0     Production"
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production

--test for 11g

CREATE TABLE XML_TEST(
     ID NUMBER(2,0),
     XML XMLTYPE
);

INSERT INTO XML_TEST
VALUES
(
     1,
     XMLTYPE
     ('
          <msg>
               <data>
                    <fields>
                         <id>g1</id>
                         <dat>data1</dat>
                    </fields>
               </data>
          </msg>
     ')
);

INSERT INTO XML_TEST
VALUES
(
     2,
     XMLTYPE
     ('
          <msg>
               <data>
                    <fields>
                         <id>g2</id>
                         <dat>data2</dat>
                    </fields>
               </data>
          </msg>
     ')
);

INSERT INTO XML_TEST
VALUES
(
     3,
     XMLTYPE
     ('
          <msg>
               <data>
                    <fields>
                         <id>g3</id>
                         <dat>data3</dat>
                    </fields>
                    <fields>
                         <id>g4</id>
                         <dat>data4</dat>
                    </fields>
                    <fields>
                         <dat>data5</dat>
                    </fields>
               </data>
          </msg>
     ')
);

SELECT
     t.id,
     x.dat,
     y.seqno,
     y.id_real
FROM
     xml_test t,
     XMLTABLE
     (
          '/msg/data/fields'
          passing t.xml
          columns
               dat VARCHAR2(10) path 'dat',
               id XMLTYPE path 'id'
     )x LEFT OUTER JOIN
     XMLTABLE
     (
          'id'
          passing x.id
          columns
               seqno FOR ORDINALITY,
               id_real VARCHAR2(30) PATH '.'
     )y ON 1=1
;

ID     DAT     SEQNO     ID_REAL
--     -----     -----     -------
1     data1     1     g1
2     data2     1     g2
3     data3     1     g3
3     data4     1     g4
3     data5          
    This is all nice, now the problem:
    Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bi
PL/SQL Release 10.2.0.1.0 - Production
"CORE     10.2.0.1.0     Production"
TNS for HPUX: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production

--exactly the same environment as 11g (tables and rows)
SELECT
     t.id,
     x.dat,
     y.seqno,
     y.id_real
FROM
     xml_test t,
     XMLTABLE
     (
          '/msg/data/fields'
          passing t.xml
          columns
               dat VARCHAR2(10) path 'dat',
               id XMLTYPE path 'id'
     )x LEFT OUTER JOIN
     XMLTABLE
     (
          'id'
          passing x.id
          columns
               seqno FOR ORDINALITY,
               id_real VARCHAR2(30) PATH '.'
     )y ON 1=1
;

ID     DAT     SEQNO     ID_REAL
--     -----     -----     -------
1     data1     1     g1
2     data2     1     g2
3     data3     1     g3
3     data4     1     g4
    As you can see in 10g that I don't have the last row, it seems that Oracle 10 g does not recognize the LEFT OUTER JOIN.

    Is this a bug?, Metalink says that sometimes we can have an ORA-0600, but in this case there is no error results returned, just incorrect.

    Help, please.

    Kind regards.

    What about try the original Oracle method for outer joins? Using (+) without the extra space

    XMLTABLE(...COLUMNS ... id XMLTYPE PATH ... ) x,
XMLTABLE(... PASSING x.id ...) (+) y

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