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Asked by: teera

I have a field01 and feild02 how can i write my sql comman to get data like C and D below


table a                 table b                                    

field01                 field 02                                                  
0001                0001
0003                0002
0005                0003
0006                0004




field c               field d                
0005                0002
0006                0004


The out put of feilc is the member of table a ,field01 that not be long to table 02 ,feild 02
The out put of feild is the member of table b ,field02 that not be long to table 01 ,feild01

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Asked On
2004-03-17 at 00:27:03ID20921602
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MySQL Server

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    Answers

     

    by: LowfatspreadPosted on 2004-03-17 at 01:29:08ID: 10613675

    you basically can't

    explain the business reason behind this...

    which database system are you using?

    in sql server you could do something like...

    select field1,identity(int,1,1) as rowno into #temp1
    from table1
     where not exists (select field2 from table2
                               where field1 = field2)
    select field2,identity(int,1,1) as rowno into #temp2
    from table2
     where not exists (select field1 from table1
                               where field1 = field2)


    select field1 as fieldc,field2 as fieldd
    from #temp1 inner join #temp2
    on #temp1.rowno=#temp2.rowno


     

    by: teeraPosted on 2004-03-17 at 01:41:52ID: 10613753

    I use mysql sever and Use phpMyadmin that can write sql command

     

    by: vaneklPosted on 2004-03-17 at 07:37:07ID: 10616012

    the solution is this:

    select field01 as fieldc
    from tableA left join tableB on field01 = field02
    where field02 is null;

    select field02 as fieldd
    from tableB left join tableA on field01 = field02
    where field01 is null;

     

    by: snoyes_jwPosted on 2004-03-17 at 09:20:13ID: 10616941

    vanekl's solution is the most common, and will work for all versions of MySQL.

    If you happen to be using version 4.1 or later, you can also use a subselect, much like LowFatSpread's solution:
    SELECT field01 FROM tableA WHERE field01 NOT IN (SELECT field02 FROM tableB);

     

    by: psadacPosted on 2004-03-17 at 11:48:45ID: 10618099

    if you are very patient you can wait mysql 5.1 and use :

    SELECT tablea.field01 AS fieldc, tableb.field02 AS fieldd
    FROM tablea FULL OUTER JOIN tableb
    WHERE tablea.field01 IS NULL OR tableb.field02 IS NULL

    otherwise use vanekl solution in real world ;-)

    20120131-EE-VQP-002

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