我写的推荐系统。哈哈。表格什么的自己猜吧。 无 insert into recommend (select ut.userid,it.itemid, now() from user_tag ut,item_tag it where exists( select it.tagid from item_tag it where it.tagid in (select ut.tagid from user_tag ut)))
我写的推荐系统。哈哈。表格什么的自己猜吧。 insert into recommend (select ut.userid,it.itemid, now() from user_tag ut,item_tag it where exists( select it.tagid from item_tag it where it.tagid in (select ut.tagid from user_tag ut)))
