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RE: Alternative way to write delete query

From: Igor Neyman <ineyman_at_perceptron.com>
Date: Tue, 27 May 2003 08:34:56 -0800
Message-ID: <F001.005A3597.20030527083456@fatcity.com>


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: Igor Neyman
  INET: ineyman_at_perceptron.com

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Received on Tue May 27 2003 - 11:34:56 CDT

Original text of this message

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