如何从具有2个不同标题的两个表中查找百分比

Question

我有2个表，带有offender_id的报告和带有account_id的游戏。每个帐户都有多个游戏，有些还有针对他们的报告。

我需要能够返回每个帐户报告的游戏百分比。

游戏

account_id  
1     
1     
1     
2     
2     
2     
3     
3     

报告

offender_id   
1     
2    
2     
3     
3     

必填报告结果

ID   PercentageReported    
1       33%                         
2       66%                         
3       100%                         

Answer 1

如果我理解这一点，那么也许每场比赛都记录在Reports表中，每次进攻都记在SELECT temp1.account_id, gamesPlayedCount, IFNULL(gamesOffendedCount, 0) AS gamesOffendedCount, CAST(100*IFNULL(gamesOffendedCount, 0)/gamesPlayedCount AS DECIMAL(10, 2)) AS offencePercentage FROM ( SELECT g.account_id, COUNT(g.account_id) AS gamesPlayedCount FROM GamesPlayed g GROUP BY g.account_id ) AS temp1 LEFT JOIN ( SELECT r.offender_id, COUNT(r.offender_id) AS gamesOffendedCount FROM Reports r GROUP BY r.offender_id ) AS temp2 ON temp1.account_id = temp2.offender_id ？

所以，如果是这种情况，那么查询可能写成如下：

= blog( 'portfolio' ).articles.map { | r | r.data.category }.uniq.sort