sorry, i can't quite get what u meant dunno how to do as u said > You might want to associate the attributes with categories > in a different table. This way you could put an attribute > into multiple categories. You could also specify the displayORder > in the category table as well. >
>On Tue, 2002-06-18 at 15:42, Xuefer wrote: >> thx for replying >> >> it's really a new course for me >> >> option 1 will still make lots of tables >> >> does option 2 waste of space ? >> cause 2 id with only 1 value > > How many tables are created and how much spaces is wasted depends on > the data and the design. > > Test a few different designs - see how much space the designs take > and how complex the queries are. > >> >> i'm going to make table as described below. >> i wonder it's feasibility >> >> also bring another question here: >> my forum has "favorite" table >> for use to collect their favorite post >> >> Table `favorite`: >> cols: userid INT, postid INT >> unique index(userid, postid) >> >> only a pair of ID pre row >> question: does this struct waste of space? if so, any better solution ? > > This is probably the best way to handle it. > >> >> ----------------- >> struct of product attribute: >> ----------------- >> >> Table `cate`: >> cols: cateID cateName >> example row: >> 1 "switches-100" >> >> Table `Attribute`: >> cols: cateID attributeID attributeName displayOrder >> example row: >> 1 1 color 1 >> 1 2 size 2 >> >> Table `product`: >> cols: cateID productID productName productDescription >> example row: >> 1 1 "greenswitch" blah blash... >> >> Table `AttributeValue`: >> cols: productID attributeID attributeValue(varchar) >> example row: >> 1 1 green >> 1 2 10*10 >> ----------------- >> >> to delete attribute: >> DELETE FROM Attribute where attributeID=$id >> DELETE FROM AttributeValue where attributeID=$id > >Good Luck! >-- > __ ___ ___ ____ __ > / |/ /_ __/ __/ __ \/ / Zak Greant <[EMAIL PROTECTED]> > / /|_/ / // /\ \/ /_/ / /__ MySQL AB, Advocate >/_/ /_/\_, /___/\___\_\___/ Calgary, Canada > <___/ www.mysql.com --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
