I am getting below error,if I am using "key" as column. mysql> create table session(key char(16) not null,data blob,expiry int(11) unsigned not null,primary key (key)) ENGINE=MyISAM default charset=utf8; ERROR 1064 (42000): 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 'char(16) not null,data blob,expiry int(11) unsigned not null,primary key (key)) ' at line 1 By replacing "key" to "key1" it works fine. mysql> create table session(key1 char(16) not null,data blob,expiry int(11) unsigned not null,constraint pk_example primary key (key1)) ENGINE=MyISAM default charset=utf8; Query OK, 0 rows affected (0.00 sec) ... View more