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) ) )
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