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RE: Alternative way to write delete query

From: Mark Richard <mrichard_at_transurban.com.au>
Date: Tue, 27 May 2003 16:19:39 -0800
Message-ID: <F001.005A3B64.20030527161939@fatcity.com>


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 <ORACLE-L_at_fatcity.com>                
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                      Sent by:                 Subject:  RE: Alternative way to write delete query                                  
                      root_at_fatcity.com                                                                                              
                                                                                                                                    
                                                                                                                                    
                      28/05/2003 02:34                                                                                              
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                      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

-----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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Author: Mark Richard
  INET: mrichard_at_transurban.com.au

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Received on Tue May 27 2003 - 19:19:39 CDT

Original text of this message

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