Re: what is the fastest way to update a big table with more than

thanks Mercadante,
actually i have to use trim() function because the type of join.totid (varchar2(255) and type of cs.totid (char(255) are different.So when i compare those two values
my program can never find an equal value.I tried to change both of htem to char(8) , but i am having an error message saying that it can't be changed when the table is not empty. When i try to create new table with a totid of char(8), then i ama having "two large data " error message. Any idea how to avoid that?
cheers :)
----- Original Message -----
To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Wednesday, October 31, 2001 9:00 PM

> yilmaz,
>
> First of all, your query is probably performing a full table scan on each
> table because of your use of the TRIM function.
> Remove this.
>
> Secondly, why join the two tables together? Just query the table with the
> newer data in a loop, and update the older table like this:
>
> declare
> cursor c1 is
> select j.totid, j.source from join j where j.source is
not
> null;
> tot join.TOTID%type;--totid is the primary key for both
tables
> src cs.source%type;--source is the column to be updated
> begin
> open c1;
> loop
> fetch c1 into tot,src;
> exit when c1%notfound;
> update cs set source=src where totid=tot;
> end loop;
> commit;
> close c1;
> end;
>
> Hope this helps.
>
> Tom Mercadante
> Oracle Certified Professional
>
>

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Author: yilmaz
  INET: yilmaz_at_hwajet.com.tw

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