MySQL计算百分比方法介绍
根据相应条件抽出相应count数（myCount）抽出总count数(totalCount)
计算百分比：myCount / totalCount * 100
四舍五入：使用ROUND函数ROUND(number，要保留的小数位)，ROUND(myCount / totalCount * 100,1)
下面给出示例供参考：
SELECT ROUND(T1.co/T2.totalCo*100,1)
FROM
(SELECT COUNT(*) AS co
FROM fup1
WHERE fup1.PERIOD6 = 1
AND fup1.P6CCTCHK = 2) T1,
(SELECT COUNT(*) AS totalCo
FROM fup1
WHERE fup1.PERIOD6 = 1)T2;
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