Andrus <kobruleht2@hot.ee> writes:
> Product table as both main products and subproducts with sizes. Size is
> separated by main product code always by / character:
> SHOE1-BLACK
> SHOE1-BLACK/38
> SHOE1-BLACK/41
> SHOE1-BLACK/42
> SHOE1-BLACK/43
> SHOE2/XXL
> SHOE2/L
You could probably have devised a worse data representation if
you really tried, but it would have taken some effort. Separate
the product code and size into two columns --- if there's somebody
who really wants to see them in the above format, give them a
view or generated column. Then instead of the impossible-to-optimize
queries you showed, you could do something like
select toode.toode , n2, n3, n4
from toode, vordlusajuhinnak
where toode.toode = vordlusajuhinnak.toode;
Anytime you're trying to join two tables on something that isn't
a plain equality condition (or ANDed conditions), you're in for
a world of hurt.
regards, tom lane
