linking rows
Let's say I have a query that performs select * from Account one of the columns from Account (city) is actually a key which may be either numeric or character. There is a table called City which contains keys and names of cities. and I want the City.Name value where Account.city matches City.ID. I need the most efficient way to do this: examples, keywords, and URLs to relevant documentation are all welcome. thanks tim -- Tim Johnson [EMAIL PROTECTED] http://www.alaska-internet-solutions.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: linking rows
Tim Johnson [EMAIL PROTECTED] wrote on 02/23/2006 12:26:35 PM: Let's say I have a query that performs select * from Account one of the columns from Account (city) is actually a key which may be either numeric or character. There is a table called City which contains keys and names of cities. and I want the City.Name value where Account.city matches City.ID. I need the most efficient way to do this: examples, keywords, and URLs to relevant documentation are all welcome. thanks tim -- Tim Johnson [EMAIL PROTECTED] http://www.alaska-internet-solutions.com First off, columns can either be numeric or character-based not both. You can store arrangements of the characters 0 through 9 in a character-based field but those are not numbers, they are strings that look like numbers. Your description makes it sound like you have a table that has data in a column called 'city' that looks like: Atlanta Boston 15 10 24 Paris Rome 215 Tokyo or am I mistaken? Back to your direct question: How you link two tables is called joining. There are tons of examples and tutorials of how to join tables. One of my favorites is http://sqlzoo.net/ It takes you through everything you need in order to get your feet wet and it gives you the ability to immediately try out what you are being taught. If you work through their examples you should be able to make some decent headway. I also recommend you read this article about normalization: http://dev.mysql.com/tech-resources/articles/intro-to-normalization.html There is a query that can do what you want but I strongly suggest you review your design before moving too much farther into this project. Shawn Green Database Administrator Unimin Corporation - Spruce Pine
Re: linking rows
* [EMAIL PROTECTED] [EMAIL PROTECTED] [060223 09:09]: Tim Johnson [EMAIL PROTECTED] wrote on 02/23/2006 12:26:35 PM: I need the most efficient way to do this: examples, keywords, and URLs to relevant documentation are all welcome. First off, columns can either be numeric or character-based not both. You can store arrangements of the characters 0 through 9 in a character-based field but those are not numbers, they are strings that look like numbers. Of course. Didn't mean to imply other wish. Your description makes it sound like you have a table that has data in a column called 'city' that looks like: Atlanta Boston 15 10 24 Paris Rome 215 Tokyo or am I mistaken? You got it. Back to your direct question: How you link two tables is called joining. There are tons of examples and tutorials of how to join tables. One of my favorites is Deliberately left out an inquery about join to encourage possibly other suggestions. :-) http://sqlzoo.net/ I also recommend you read this article about normalization: http://dev.mysql.com/tech-resources/articles/intro-to-normalization.html Those are the links that I needed. Getting up to speed on 'join is my solution... Thanks (time to do my homework) tim -- Tim Johnson [EMAIL PROTECTED] http://www.alaska-internet-solutions.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
