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RE: Alternative way to write delete query

From: Chelur, Jayadas {PBSG} <jayadas.chelur_at_pepsi.com>
Date: Wed, 28 May 2003 06:54:54 -0800
Message-ID: <F001.005A430A.20030528065454@fatcity.com>


delete <table1>
where exists

       (
       select 1
       from   (
              select <column> from <table_a>
              union all
              select <column> from <table_b>
              ) a
       where  a.<column> = <table1>.<column>
       );

-----Original Message-----

Sent: Wednesday, May 28, 2003 9:10 AM
To: Multiple recipients of list ORACLE-L

If anybody knows, it must be Lex...

Lex, you genius of geniuses and SQL Logician of them all - can you help here?

Mogens

Mark Richard wrote:

This is quite close to what I was thinking of however it doesn't seem to

work for Oracle. Does anyone know if there is similar syntax available in

the Oracle world? I've looked at the Oracle (8.1.7) doco but can't see how

I can achieve what I want to do.  

                      "Igor Neyman"


                      <ineyman_at_perceptr        To:       Multiple recipients
of list ORACLE-L <mailto:ORACLE-L_at_fatcity.com> <ORACLE-L_at_fatcity.com>
                      on.com>                  cc:


                      Sent by:                 Subject:  RE: Alternative way
to write delete query                                  

                       root_at_fatcity.com <mailto:root_at_fatcity.com>


 


 


                      28/05/2003 02:34


                      Please respond to


                      ORACLE-L


 


 










Small correction for SQL Server / Sybase, if anyone cares, of course -:)

Delete table1

  from table_a

where column1 = col_a

    or column1 = col_b

Igor Neyman, OCP DBA

ineyman_at_perceptron.com <mailto:ineyman_at_perceptron.com>

-----Original Message-----

OLLIG Sent: Tuesday, May 27, 2003 9:35 AM

To: Multiple recipients of list ORACLE-L

Mark -

you could also do it with 2 deletes something like this:

delete

  from (select column1

          from table1

             , table_a

         where column1 = col_a)

delete

  from (select column1

          from table1

             , table_b

         where column1 = col_b)

couldn't find a way to avoid the "ORA-01752: cannot delete from view

without

exactly one key-preserved table" with the or condition. perhaps someone

who

isn't still clearing the brain cobwebs after a long weekend can see a

solution there.

FWIW - i'm pretty sure SQL Server & Sybase will let you get by with

this:

delete

  from table1

     , table_a

     , table_b

 where column1 = col_a

    or column1 = col_b

(don't have a sandbox handy to confirm though) maybe that's what you

were

thinking of?

-----Original Message-----

Sent: Tuesday, May 27, 2003 12:27 AM

To: Multiple recipients of list ORACLE-L

Hi List,

I'm having a mental blank and looking for suggestions... I'm trying to

remember alternative ways to write the below query:

delete from table

where column in (select col_a

              from table_b

              union all

              select col_b

              from table_b);

Having said that, I don't mind if you simplify the nested query down to

"select col_a from table_b" even. I just have a feeling that I've seen

an

equivalent query written totally differently but I can't remember how.

I

have a feeling it effectively allows more than one table to be mentioned

in

the delete without needing a nested query (like the options available in

normal selects).

Any suggestions?

Thanks,

      Mark.

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--

Please see the official ORACLE-L FAQ:  http://www.orafaq.net
<http://www.orafaq.net> 

--

Author: Mark Richard

  INET:  mrichard_at_transurban.com.au <mailto:mrichard_at_transurban.com.au> 



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<http://www.fatcity.com> 

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Received on Wed May 28 2003 - 09:54:54 CDT

Original text of this message

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