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根據相應條件抽出相應count數(myCount)
抽出總count數(totalCount)
計算百分比:myCount / totalCount * 100
四舍五入:使用ROUND函數ROUND(number,要保留的小數位),ROUND(myCount / totalCount * 100,1)
下面給出示例供參考:
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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