Try the following, based solely on your quote above, not on any thorough inspection of the database. I have not tested this. Use at your own risk.
CAVEAT: USE AT YOUR OWN RISK! MAKE DATABASE BACKUPS BEFORE DOING ANY OF THIS SORT OF THING!
ONE SHOULD RARELY EVER USE "truncate" STATEMENTS ON THE DATABASE! THIS IS A DESTRUCTIVE ACTION AND WILL RESULT IN LOSS OF DATA!
Code:
truncate table orders;
truncate table orders_products;
truncate table orders_status_history;
truncate table orders_products_attributes;
truncate table orders_products_download;
truncate table orders_total;
truncate table admin_activity_log;
truncate table authorizenet;
truncate table banners_history;
truncate table counter;
truncate table counter_history;
truncate table coupon_email_track;
truncate table coupon_gv_customer;
truncate table coupon_gv_queue;
truncate table coupon_redeem_track;
truncate table coupon_restrict;
truncate table customers_basket;
truncate table customers_basket_attributes;
truncate table db_cache;
truncate table email_archive;
truncate table files_uploaded;
truncate table paypal;
truncate table paypal_payment_status_history;
truncate table paypal_session;
truncate table sessions;
truncate table upgrade_exceptions;
truncate table whos_online;
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