RE: [PHP-DB] help me on projecting some tables

not really sure how to do this, other than planning for as much as you can in your original tables, then have a spare table with four columns - Row_ID, Characteristic_Name, Characteristic_Value, and Product_Refer_ID. so then if you get a new characteristic (eg colour) then you could have values 1, colour, blue, 4(the product with this characteristic). then the next line might be 2,colour,green,8 then 2,density,45kg/m3,8 etc. not sure this is the best way, but the only way i can think of to have various additional characteristics for some products. hope it helps?? Matt -----Original Message----- From: Carlo Loiudice [mailto:porcapuzza@yahoo.it] Sent: 16 November 2001 10:48 To: PHP DB Subject: [PHP-DB] help me on projecting some tables Hi, I've to store in a BD some alimentary product, and there are lot of informations like chemical, physical, nutritional characteristics , ... I don't know how to store this info. So I've a lot of product with a lot of corresponding characteristics. I've thought about to create a table where to store all chemical characteristics, a table for nutritional, ecc. and put in the product table the refer ID to all this caracteristic tables. But in this way, there's the problem that now I'm storing 3 chemical charact. but tomorrow I'd like to add a new charact., and I wouldn't change tha table structure adding a new column every time I've a new field that I haven't expected. Can someone show me the right strategy to resolve this kind of problem? Ciao, Carlo ______________________________________________________________________ Abbonati a Yahoo! ADSL con Atlanet! Naviga su Internet ad alta velocità, e senza limiti di tempo! Per saperne di più vai alla pagina http://adsl.yahoo.it -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: php-db-unsubscribe@lists.php.net For additional commands, e-mail: php-db-help@lists.php.net To contact the list administrators, e-mail: php-list-admin@lists.php.net --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.295 / Virus Database: 159 - Release Date: 01/11/01 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.295 / Virus Database: 159 - Release Date: 01/11/01