Re: Matching unique primary keys

On 23 Oct 2002 at 12:39, Kevin Old wrote:

> 1) Copy the 3 "unique fields" into every table (as you mention above).
> My only question with this is how am I to do a join on a multicolumn
> primary key? The only thing I can think of would be something like:
>
> SELECT *
> FROM data_index, data_tbl
> WHERE data_index.id1 = data_tbl.id1
> AND data_index.id2 = data_tbl.id2
> AND data_index.id3 = data_tbl.id3

Well you can store the 3 fields in a table, declare the combination of them as
primary key and add a fourth field that is sequence generated and use this
sequence number as primary key in rest of them tables. Will reuce the IO
requirement by oodles..

HTH

Bye
Shridhar

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