[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: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
[PHP-DB] is it a Many-to-Many relationship ???
Ok, pardon: Table1: ID,weight,m_weight,height,m_height Table2: ID,measure_name This is the question: I've to build a query that gives me with a single select, two rows of the table2. If you can, please give me some hints about this problem: store data with relatives measure units, and a way to make format conversions: for example convert lire to euro, or gr. to kg. I'm thinking to store in table2 the conversion values. ciao __ 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: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
[PHP-DB] is it a Many-to-Many relationship ???
HI again. I'm doing this: I'm a table where there are 4 fields like this: height,measure height,weight, measure weight. Then a 2nd table, where I've all measures defibed. How can I select 2 different rows from the 2nd (measures) table related to 1 entry in the 1st table with a single select query? Thanks, 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: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
[PHP-DB] JOIN operations
Hi, I'm preforming a join between 2 Mysql tables in this way: table_name: ID,name,ID_city table_city: ID,city when I query this: SELECT table_name.name,table_city.ID,table_city.city FROM table_name,table_city WHERE table_name.ID_city=table_city.ID The result is a new table with this fields: result_table: name,city. There isn't the field table_name.ID_city!!! Here's the question: I need also this field ID_city because there's a function that builds a list box with all the cities, and search for a html hidden input named ID_city (like the table field) to eventually highlight that entry. can someone help me? is there a way to select also the ID_city field without break the join mechanism ? 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: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
[PHP-DB] Automatic JOIN
Pardon, another question: Is there a way to say to Mysql to automatically detect a relation between 2 table and perform the join operation when there's a SELECT query ? I Hope this isn't a stupide question! But I've seen that in the detested MS Access, there a simple way so make a visual join between a field in a table with another field in another table. When there's a select on the 1st table, access automatically open the linked table and fetch the corresponding field. How to make this in mysql? Carlo, again __ 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: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
