Baron Schwartz wrote:
Hi Afan,
Afan Pasalic wrote:
hi,
if I have column order_id(int(4)) null do I have to index it too. I'm
going to use it ONLY for sorting records.
It depends a lot on how much data is in the table, etc etc. An index
will make sorting more efficient in the general case when you have a
decent amount of data. But it's hard to be specific with so little
information.
Baron
I have table products (product_id is PK). I have table categories
(cat_id is PK). since the product can be in more than one category, I
have prod_cat table:
create prod_cat(
cat_id int(8) unsigned not null,
prod_id int(8) unsigned not null,
order_id int(4) unsigned null,
PRIMARY KEY (cat_id, prod_id)
) engine=Innodb;
would it be enough info?
thanks.
-afan
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