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Home > Database > Mysql Tutorial > 我写的推荐系统。哈哈。表格什么的自己猜吧

我写的推荐系统。哈哈。表格什么的自己猜吧

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Release： 2016-06-07 14:57:09
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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。

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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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