我有一个数据库,我用于辩论比赛我试图排名积分,看看哪些学校将在学期末的决赛中发挥作用.
我有这个工作如下所示但是我无法绕过ptc字段,它目前返回最多4个小数位,例如0.6667如果他们赢得了3个辩论中的2个.
SELECT t.id,t.name AS name,SUM(t.id = d.winnerid) AS w,SUM(t.id != d.winnerid) AS l,SUM(t.id = d.winnerid)/(SUM(t.id = d.winnerid)+SUM(t.id != d.winnerid)) AS ptc
FROM debates AS d
JOIN teams AS t ON t.id IN (d.hostid,d.visitid)
WHERE d.visitid != -1
AND d.debatedate < CURDATE()
GROUP BY t.id
ORDER BY ptc DESC
我相信我必须在这里使用十进制(2,2)但是我无法正确使用语法我尝试了一些不同的东西,比如
SUM(t.id = d.winnerid)/(SUM(t.id = d.winnerid)+SUM(t.id != d.winnerid)) AS ptc decimal (2,2)
如果需要,我很乐意提供有关表格的更多信息,但我不认为这是必需的？