1211. 查询结果的质量和占比

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题目链接：1211. 查询结果的质量和占比

代码如下：

# Write your MySQL query statement below
select query_name,round(avg(rating/position),2) as quality,round(sum(if(rating<3,1,0))*100/count(*),2) as poor_query_percentage
from Queries
where query_name is not null
group by query_name