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SELECT COUNT(*) from order_info_ref as oif where oif.order_time>='2016-03-02 00:01:00' and oif.order_time<='2016-03-02 23:59:59' and oif.ca_user_id NOT in
(SELECT oi.ca_user_id from order_info_ref as oi where oi.order_time>='2016-03-01 00:01:00' and oi.order_time<='2016-03-01 23:59:59');