Error in MySQL database code while importing - mysql

Question

my code :
CREATE TABLE IF NOT EXISTS `friends` (
`Id` INT(10) NOT NULL AUTO_INCREMENT,
`providerid` INT(10) NOT NULL AUTO_INCREMENT,
`requestid` INT(10) NOT NULL AUTO_INCREMENT,
`status` BINARY(1) NOT NULL,
PRIMARY KEY (`Id`)
);
CREATE TABLE IF NOT EXISTS `messages` (
`Id` INT(255) NOT NULL AUTO_INCREMENT,
`fromuid` INT(255) NOT NULL,
`touid` INT(255) NOT NULL,
`sentdt` DATETIME NOT NULL,
`read` TINYINT(1) NOT NULL DEFAULT '0',
`readdt` DATETIME DEFAULT NULL,
`messagetext` LONGTEXT CHARACTER SET utf8 NOT NULL,
PRIMARY KEY (`Id`)
);
CREATE TABLE IF NOT EXISTS `users` (
`Id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
`username` VARCHAR(45) NOT NULL DEFAULT '',
`password` VARCHAR(32) NOT NULL DEFAULT '',
`email` VARCHAR(45) NOT NULL DEFAULT '',
`date` DATETIME NOT NULL DEFAULT '0000-00-00 00:00:00',
`status` TINYINT(3) UNSIGNED NOT NULL DEFAULT '0',
`authenticationTime` DATETIME NOT NULL DEFAULT '0000-00-00 00:00:00',
`userKey` VARCHAR(32) NOT NULL DEFAULT '',
`IP` VARCHAR(45) NOT NULL DEFAULT '',
`port` INT(10) UNSIGNED NOT NULL DEFAULT '0',
PRIMARY KEY (`Id`)
);
error : #1064 - You have an error in your SQL syntax; check the manual
that corresponds to your MySQL server version for the right syntax to
use near 'CREATE TABLE IF NOT EXISTS messages (
Id int(255) NOT NULL AUTO_INCREMENT,' at line 8
so plz help me correcting the code...
Thank you

Answer 1

There are few errors in your script.
1) there can be only one autoincrement key and it must be defined as a key
2) spelling mistable in third query of DEFAULT in
`email` varchar(45) NOT NULL DEFAULT '',
3) DEFAULT keyword used twice in 3rd query for below field and missing NULL for NOT NULL
`authenticationTime` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
CORRECT query:-
CREATE TABLE IF NOT EXISTS `friends` (
`Id` int(10) NOT NULL AUTO_INCREMENT,
`providerid` int(10) NOT NULL ,
`requestid` int(10) NOT NULL ,
`status` binary(1) NOT NULL ,
PRIMARY KEY (`Id`));
CREATE TABLE IF NOT EXISTS `messages` (
`Id` int(255) NOT NULL AUTO_INCREMENT,
`fromuid` int(255) NOT NULL,
`touid` int(255) NOT NULL,
`sentdt` datetime NOT NULL,
`read` tinyint(1) NOT NULL DEFAULT '0',
`readdt` datetime DEFAULT NULL,
`messagetext` longtext CHARACTER SET utf8 NOT NULL ,
PRIMARY KEY (`Id`)
);
CREATE TABLE IF NOT EXISTS `users` (
`Id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`username` varchar(45) NOT NULL DEFAULT '',
`password` varchar(32) NOT NULL DEFAULT '',
`email` varchar(45) NOT NULL DEFAULT '',
`date` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
`status` tinyint(3) unsigned NOT NULL DEFAULT '0',
`authenticationTime` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
`userKey` varchar(32) NOT NULL DEFAULT '',
`IP` varchar(45) NOT NULL DEFAULT '',
`port` int(10) unsigned NOT NULL DEFAULT '0',
PRIMARY KEY (`Id`)
)