获取较大组的百分比

下面的查询是一种丑陋的一种，所以我希望我已经把它的间隔足够好，以使其可读。该查询查找来自某个特定医院的人员的百分比。例如，如果100个人住在X县，20个去A医院，80个去B医院查询输出。这种事情到底是怎么回事？让我知道是否需要记录查询或我可以做的任何事情以使其更清楚。获取较大组的百分比

hospital A 20 
hospital B 80

下面的查询工作完全一样我想它，但它给我想：怎么会这样对我的表中每一个县办呢？

select hospitalname, round(cast(counts as float)/cast(fayettestrokepop as float)*100,2)as percentSeen 
from 
(

SELECT  tblHospitals.hospitalname, COUNT(tblHospitals.hospitalname) AS counts, tblStateCounties_1.countyName, 
          (SELECT  COUNT(*) AS Expr1 
          FROM   Patient INNER JOIN 
                tblStateCounties ON Patient.stateCode = tblStateCounties.stateCode AND Patient.countyCode = tblStateCounties.countyCode 
          WHERE  (tblStateCounties.stateCode = '21') AND (tblStateCounties.countyName = 'fayette')) AS fayetteStrokePop 
FROM   Patient AS Patient_1 INNER JOIN 
         tblHospitals ON Patient_1.hospitalnpi = tblHospitals.hospitalnpi INNER JOIN 
         tblStateCounties AS tblStateCounties_1 ON Patient_1.stateCode = tblStateCounties_1.stateCode AND Patient_1.countyCode = tblStateCounties_1.countyCode 
WHERE  (tblStateCounties_1.stateCode = '21') AND (tblStateCounties_1.countyName = 'fayette') 
GROUP BY tblHospitals.hospitalname, tblStateCounties_1.countyName 

) as t 
order by percentSeen desc

编辑：样本数据下面的样本数据是不带最外层查询（在as t order by一部分）。

的countsInTheCounty列是（SELECT COUNT（*）..）部分 'tblStateCounties_1.countyName'

hospitalName  hospitalCounts  countyName  countsInTheCounty 
st. james   23     X    300 
st. jude   40     X    300

现在，经过与外部查询，我们将得到

st james 0.076 (23/300) 
st. jude 0.1333 (40/300)

来源

2012-07-20 wootscootinboogie

“循环”在大多数情况下应该像黑板上的钉子。当然，有一种方法可以解决这个问题，使用县名作为额外的分组，你能显示几行样本数据，所以我们知道你是如何达到20/80的？ – 2012-07-20 19:44:25

当然，编辑在主要查询块之下。 – wootscootinboogie 2012-07-20 19:51:38

我没有回答这个问题吗？ http://stackoverflow.com/a/11086155/61305 – 2012-07-20 20:26:31

这里是我的猜测。您必须测试您的数据或提供适当的DDL +示例数据。

;WITH totalCounts AS 
(
    SELECT StateCode, countyCode, COUNT(*) AS totalcount 
    FROM dbo.Patient GROUP BY StateCode, countyCode 
) 
SELECT 
    h.hospitalName, 
    hospitalCounts = COUNT(p.hospitalnpi), 
    c.countyName, 
    countsInTheCounty = tc.totalCount, 
    percentseen = CONVERT(DECIMAL(5,2), COUNT(p.hospitalnpi)*100.0/tc.totalCount) 
FROM 
    dbo.Patient AS p 
INNER JOIN 
    dbo.tblHospitals AS h 
    ON p.hospitalnpi = h.hospitalnpi 
INNER JOIN 
    totalCounts AS tc 
    ON p.StateCode = tc.StateCode 
    AND p.countyCode = tc.countyCode 
INNER JOIN 
    dbo.tblStateCounties AS c 
    ON tc.StateCode = c.stateCode 
    AND tc.countyCode = c.countyCode 
GROUP BY 
    h.hospitalname, 
    c.countyName, 
    tc.totalcount 
ORDER BY 
    c.countyName, 
    percentseen DESC;

来源

2012-07-20 21:04:51

获取较大组的百分比

回答

相关问题