Re: Update Query

From: Eric D. Pierce <PierceED_at_csus.edu>
Date: Wed, 30 May 2001 13:03:20 -0700
Message-ID: <F001.003146B3.20010530130247@fatcity.com>

ha, ha. you got bit by the "null" update thing too, I remember it well! :)

except for maybe some newfangled oracle8 features, the "ugly" one is the "traditional" way the manual says to do it (iirc). I have many many scripts with that kind of code in them since we load mainframe datafiles into the local oracle apps, and do a lot of cross-table updates (non-normalized, but that is mostly ok since it is archive data).

you *can* "pretty" it up a bit by using better formatting, e.g.,

update

       tablea a
   set

     ( 
       a.firstname,
       a.lastname
     )
   = 
     ( 
       select 
              b.firstname,
              b.lastname 
         from 
              tableb b
        where 
              b.id = a.id 
     )
 where 
       a.id in
     (
       select 
              b2.id
         from 
              tableb b2
      )

/

On 30 May 2001, at 11:56, CC Harvest wrote:

Date sent:              Wed, 30 May 2001 11:56:14 -0800
To:                     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>

> Seems like Oracle Doesn't have to the query like this:
>
> update tablea set firstname=tableb.firstname,
> lastname=tableb.lastname
> where tableb.id = tablea.id;
>
> I can have one, it works if it has a match for the two
> tables, otherwise the two columns updated to null:
>
> update tablea set (firstname,lastname)
> =(select firstname,lastname from tableb
> where tableb.id=tablea.id);
>
> Then the following one works, but very ugly:
>
> update tablea set (firstname,lastname)
> =(select firstname,lastname from tableb
> where tableb.id=tablea.id)
> where exists(
> select 'x' from tableb
> where tableb.id=tablea.id)

...

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-- 
Author: Eric D. Pierce
  INET: PierceED_at_csus.edu

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Received on Wed May 30 2001 - 15:03:20 CDT