Table 'sale_monthly' already exists

create table sale_monthly ( yyyy_mm char (8) not null, customer_code char(10) not null, sale_price_after_ppn double unsigned not null, buy_price_after_ppn double unsigned not null, last_update_by varchar(10) not null, last_update_date datetime not null, last_ip_address char(15) not null )Duplicate key name 'index_1'
Duplicate key name 'index_1'