what kings of name should be put on field on php SQL database

Hi friends i am stock any my database was not made on my php SQL.
I got ma message like this

Error
SQL query:

CREATE TABLE `gcards` (

`$result` VARCHAR( 1 ) ON UPDATE CURRENT_TIMESTAMP NULL AUTO_INCREMENT
) ENGINE = MYISAM COMMENT = 'gc_'

MySQL said:

#1294 - Invalid ON UPDATE clause for '$result' column


Can any one reply me what kinds of name should be put on field