mysql syntax error why? - mysql

Question

mysql query
CREATE TABLE IF NOT EXISTS 'sadakin'.'gcm_users' (
'id' int( 11 ) NOT NULL AUTO_INCREMENT ,
'gcm_regid' text,
'name' varchar( 50 ) NOT NULL ,
'email' varchar( 255 ) NOT NULL ,
'imei' varchar( 20 ) NOT NULL ,
'created_at' timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ,
PRIMARY KEY ( 'id' ) ,
KEY 'imei' ( 'imei' )
) ENGINE = InnoDB DEFAULT CHARSET = latin1 AUTO_INCREMENT =1;
Error message:
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 ''sadakin'.'gcm_users' (
'id' int( 11 ) NOT NULL AUTO_INCREMENT ,
'gcm_' at line 1
I don't find error. Help me!

Answer 1

Use backticks to enclose identifiers. Quotes are just for strings:
CREATE TABLE IF NOT EXISTS `sadakin`.`gcm_users` (
`id` int( 11 ) NOT NULL AUTO_INCREMENT ,
`gcm_regid` text,
`name` varchar( 50 ) NOT NULL ,
`email` varchar( 255 ) NOT NULL ,
`imei` varchar( 20 ) NOT NULL ,
`created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ,
PRIMARY KEY ( `id` ) ,
KEY `imei` ( `imei` )
) ENGINE = InnoDB DEFAULT CHARSET = latin1 AUTO_INCREMENT =1;

Answer 2

There is no need of any single quotes on column names
CREATE TABLE IF NOT EXISTS sadakin.gcm_users (
id int( 11 ) NOT NULL AUTO_INCREMENT ,
gcm_regid text,
name varchar( 50 ) NOT NULL ,
email varchar( 255 ) NOT NULL ,
imei varchar( 20 ) NOT NULL ,
created_at timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ,
PRIMARY KEY ( id ) ,
KEY imei ( imei )
) ENGINE = InnoDB DEFAULT CHARSET = latin1 AUTO_INCREMENT =1;

Answer 3

You have to use back-ticks instead of single quotes. Quotes are used for string literals.
Check this: http://dev.mysql.com/doc/refman/5.0/en/string-literals.html
A string is a sequence of bytes or characters, enclosed within either
single quote (“'”) or double quote (“"”)
Try:
CREATE TABLE IF NOT EXISTS `sadakin`.`gcm_users` (
`id` INT( 11 ) NOT NULL AUTO_INCREMENT ,
`gcm_regid` TEXT,
`name` VARCHAR( 50 ) NOT NULL ,
`email` VARCHAR( 255 ) NOT NULL ,
`imei` VARCHAR( 20 ) NOT NULL ,
`created_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ,
PRIMARY KEY ( `id` ) ,
KEY `imei` ( `imei` )
) ENGINE = INNODB DEFAULT CHARSET = latin1 AUTO_INCREMENT =1;