下面是用not in 实现的 ，需要修改为 exists实现 ,跪求高手帮忙解决！
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″);
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″);
解决方案
40
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 not exists (select 1 from order_info_ref where order_time>="2016-03-01 00:01:00" and order_time<="2016-03-01 23:59:59" and ca_user_id=oif.ca_user_id )
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