magento - mysql drop statement with -- -

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what difference between drop table , --drop table in mysql

for example: i'm getting error if use -- in other places of magento using -- before drop.

--drop table if exists {$this->gettable('faq/dinkchika')}; create table if not exists {$this->gettable('faq/dinkchika')} (   `faq_id` int(11) not null auto_increment,   `faq_question` varchar(255) default null,   `faq_answer` varchar(255) default null,   primary key (`faq_id`) ) engine=innodb default charset=utf8;   "); 

use white space after -- ,if not using whitespace after -- not count comment.after whitespace query this. -- drop table if exists {$this->gettable('faq/dinkchika')}; create table if not exists {$this->gettable('faq/dinkchika')} (   `faq_id` int(11) not null auto_increment,   `faq_question` varchar(255) default null,   `faq_answer` varchar(255) default null,   primary key (`faq_id`) ) engine=innodb default charset=utf8;   "); or may use #(hash) ,  try this: drop table if exists table_name; , continue creating table, guaranteed no longer exist. hope you..

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