Max key length error
Hi I'm new to MySql and I'm trying to set up a database table, and I keep getting an error saying: Max key length is 500 I have looked everywhere I can think of but I can't find an explanation for what is causing the problem so I can fix it, can anyone help me? Thanks, Brian Rivet
Re: Max key length error
On 10 Jul 2003 at 16:19, Brian Rivet wrote: Max key length is 500 I have looked everywhere I can think of but I can't find an explanation for what is causing the problem so I can fix it, can anyone help me? Presumably your key length is too long, but since you don't give us any clue about your table structure or indexes (by posting your CREATE TABLE statement, for example) what do you expect us to be able to say? -- Keith C. Ivey [EMAIL PROTECTED] Tobacco Documents Online http://tobaccodocuments.org -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Max Key Length Error
Sorry, I'm a little new at this, here's the statement: CREATE TABLE `TblUsers` (`UserId` INT(5) UNSIGNED DEFAULT NULL NOT NULL AUTO_INCREMENT, `FirstName` VARCHAR(255) DEFAULT 'unknown' NOT NULL, `LastName` VARCHAR(255) DEFAULT 'unknown' NOT NULL, `UserName` VARCHAR(255) DEFAULT 'unknown' NOT NULL, `UserPass` VARCHAR(255) DEFAULT 'unknown' NOT NULL , PRIMARY KEY (`UserId`), INDEX (`UserId`, `LastName`, `UserName`), UNIQUE (`UserId`, `UserName`)) It says the max key length is 500, I'm not sure what it's referring to, so I don't know what to fix. Thanks for any help you can give me. Brian Rivet
Re: Max Key Length Error
On 10 Jul 2003 at 16:33, Brian Rivet wrote: CREATE TABLE `TblUsers` (`UserId` INT(5) UNSIGNED DEFAULT NULL NOT NULL AUTO_INCREMENT, `FirstName` VARCHAR(255) DEFAULT 'unknown' NOT NULL, `LastName` VARCHAR(255) DEFAULT 'unknown' NOT NULL, `UserName` VARCHAR(255) DEFAULT 'unknown' NOT NULL, `UserPass` VARCHAR(255) DEFAULT 'unknown' NOT NULL , PRIMARY KEY (`UserId`), INDEX (`UserId`, `LastName`, `UserName`), UNIQUE (`UserId`, `UserName`)) It says the max key length is 500, I'm not sure what it's referring to, so I don't know what to fix. INDEX (`UserId`, `LastName`, `UserName`) is made up of an INT and two VARCHAR(255)s, which is more than 500 characters. You should use a prefix of the VARCHARs instead of the whole thing: INDEX (UserId, LastName(20), Username(20)) -- rather than 20 you can use whatever number is necessary to distinguish most of your strings (it doesn't matter much). Also, the last index (UNIQUE(UserId, UserName)) is pointless, because UserId is already unique on its own. -- Keith C. Ivey [EMAIL PROTECTED] Tobacco Documents Online http://tobaccodocuments.org -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
