Mysql 选择平均评级介于

我有两张桌子：

表biz和表biz_评级

生意

商务id int 名称varchar 商业评级

商业评级id int 商务id int 评级整数 我想要一个查询来选择平均评级在1-2或3-4之间的所有业务行，或者<5或>5评级是一个从0到5的数字

我真的不知道如何开始

我现在有这样的东西：

SELECT
    biz_id
FROM
    biz
WHERE
    biz_id IN
    (SELECT biz_id FROM biz_rating WHERE AVG(rating) BETWEEN 0 AND 5)
ORDER BY
    biz_id ASC

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但这根本不起作用。

只需使用聚合即可。您甚至不需要加入：

select br.biz_id
from biz_rating br
group by br.biz_id
having avg(rating) between 1 and 2;  -- or whatever limits you want

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如果需要名称和id，可以加入表

 select biz_id,name,b2.avgrating
 from BIZ as B1,
( select biz_id as bid, avg(rating) as avgrating
 from biz_rating
 group by biz_id 
 having avg(rating) between 0 and 5) as B2

 where B1.biz_id=B2.bid

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如果您想添加分组依据并在子选择中从何处切换到何处，这也将选择平均评分。