[PHP-DB] How do I know when to
Hi, I am really new to MySQL and am wondering this: I understand how to make a database and tables but what I don't understand is when to make a row an int with auto_increment or just a plain int. Or why would you use varchar(50) instead of char(50). Could someone please explain what is happening and why? Thank you Jerry -- 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]
Re: [PHP-DB] How do I know when to
On Fri, 11 Jan 2002 15:02:00 -0800 Jerry Leonard Jerry Leonard [EMAIL PROTECTED] wrote: Hi, I am really new to MySQL and am wondering this: I understand how to make a database and tables but what I don't understand is when to make a row an int with auto_increment or just a plain int. Or why would you use varchar(50) instead of char(50). Could someone please explain what is happening and why? Thank you Jerry Personally I would never create a row that was 'int' with auto_increment. However, I often create columns that are. When I do, I use those columns as unique identifiers for a particular row. Any of the other data may change in the row, but the unique identifier will always remain the same. The price of an item may change, as well as the packing quantity, the description and even your part number scheme, but the unique ID always remains the same. I use 'varchar(50)' when my data is of variable length because the storage space automagically grows up to 50 characters, thus using less space. 'char(50)' is just what it says, space enough to hold 50 characters. -- Raquel Nothing happens in consequence to nature, only in consequence to what we know of it. --Scully, X-Files -- 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] How do I know when to
Okay this is the way I understand the statement below. The uid will be a number from 1 to 10, max length of ten digits say starting at 1 then as the next user registers it will automatically make that user number 2. Am I correct? CREATE TABLE users ( uid int(10) unsigned NOT NULL auto_increment, -- 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]
Re: [PHP-DB] How do I know when to
On Fri, 11 Jan 2002 17:21:28 -0800 Jerry Leonard Jerry Leonard [EMAIL PROTECTED] wrote: Okay this is the way I understand the statement below. The uid will be a number from 1 to 10, max length of ten digits say starting at 1 then as the next user registers it will automatically make that user number 2. Am I correct? CREATE TABLE users ( uid int(10) unsigned NOT NULL auto_increment, You are correct that it will automatically increment the 'uid' of each new record beginning with '1', using the digits 0 - 9 (1 to 99). Check out the manual for Create Table. -- Raquel Nothing happens in consequence to nature, only in consequence to what we know of it. --Scully, X-Files -- 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]
