Thread: HOW DO I...

To All,

How do I select from one table into another table
that already exists?

In other words, if I do a:
select * into tblB from tblA where attrN like 'xxx';

and both table structures are identical I get a
ERROR: Relation 'tblB' already exists

If I : select * into table tblB from tblA where attrN like 'xxx';

I get the same answer.

I also tried using 'update'

So, How do I update a smaller table from a larger table?

For those who wish to know, This is a large parts database that
is updated monthly and I have divided it into smaller subsections for
quick access through a web-based interface. Searching the original
table is much too time consuming ( over 130,000 part #'s with Specs and
Descriptions - all running on an ancient 80386).  And I would like 
to avoid updating the smaller tables by re-building them from scratch.

Thanks for your time,

John C.
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Hello,

On Fri, 15 Oct 1999, John C Cusick wrote:

> In other words, if I do a:
> select * into tblB from tblA where attrN like 'xxx';
> 
> and both table structures are identical I get a
> ERROR: Relation 'tblB' already exists

Correct, the 'select into...' statement attempts to create the table, not
just insert rows.

I had this problem on a different system (which I haven't tried to do in
pgsql), where the solution was:

insert into tbl1
select * from tbl2 where this = that

I *think* you could declare a value list as in a normal insert. I also
think that this is SQL, not something specific to that db system, but I
may be wrong.

Regards,

Mark.
-- 
Mark Jewiss
Knowledge Matters Limited
http://www.knowledge.com

On Fri, Oct 15, 1999 at 08:54:01AM -0400, John C Cusick allegedly wrote:
> To All,
> 
> How do I select from one table into another table
> that already exists?
> 
> In other words, if I do a:
> select * into tblB from tblA where attrN like 'xxx';
> 
> and both table structures are identical I get a
> ERROR: Relation 'tblB' already exists
> 
> If I : select * into table tblB from tblA where attrN like 'xxx';
> 
> I get the same answer.
> 
> I also tried using 'update'
> 
> So, How do I update a smaller table from a larger table?
> 
> For those who wish to know, This is a large parts database that
> is updated monthly and I have divided it into smaller subsections for
> quick access through a web-based interface. Searching the original
> table is much too time consuming ( over 130,000 part #'s with Specs and
> Descriptions - all running on an ancient 80386).  And I would like 
> to avoid updating the smaller tables by re-building them from scratch.
> 
> Thanks for your time,
> 
> John C.

Shouldn't you be doing the following?

insert into tblB select * from tblA where attrN like 'xxx';

Mathijs