[英]mysql query to calculate cricket batsman average
我有一个mysql表,其中包含这样的数据。
Name |how_out |runs
------------------------------
Robin |Not out |45
Robin |lbw |25
Robin |caught |50
Robin |caught |0
Robin |bowled |30
Robin |bowled |0
.
.
.
我想要一个SQL查询,该查询返回以下列
名称,总运行次数,平均值
听起来很简单,但是对我来说唯一的问题是。 在板球比赛中,平均值并非总和(奔跑)/计数(*),而是总和(奔跑)/局数计数,其中how_out
不是“ Not out”
有人可以告诉我如何编写这样的查询吗?
由于明显的原因,我写的查询给出了错误的平均值。 我写的查询是
Select `Name`,sum(`runs`) as 'Total_runs', Sum(`runs`)/count(*)
From `batsman_stats`
group by `Name`
order by 2 desc
sql专家可以帮我吗?
谢谢
Select `Name`,sum(`runs`) as 'Total_runs', Sum(`runs`)/sum(if(how_out <> 'Not out',1,0))
From `batsman_stats`
group by `Name`
order by 2 desc
我认为您需要一个子选择:
Select Name, sum(runs) as Total_runs, Sum(runs)/(
select count(*) from batsman_stats b
where b.Name=a.Name and not b.how_out = 'Not out'
)
From batsman_stats a
group by Name
order by 2 desc
SELECT Name,
SUM(Runs) as Total_runs,
SUM(Runs)/COUNT(CASE WHEN how_out <> 'Not out' THEN 1 END) as Average
FROM batsman_stats
GROUP BY Name
ORDER BY SUM(Runs) DESC
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