连接两个子查询或带有子查询的查询SQL Server 2008

小编典典

连接两个子查询或带有子查询的查询SQL Server 2008

sql

怪物编辑：查询现在将运行，但返回错误答案。添加了一个粗略的架构。PatientID不是tblPatientVisits表中的主键，因为同一患者ID可以出现多次。

列出了每个县名，但每个计数（s.countyName）和计数（t.countyname）为1

PatientVisits   
PatientID   int
PatientState    varchar(2)
patientCounty   varchar(3)
visitNumber int - PK

tblStateCounties    
CPK stateCode   varchar(2)
CPK countyCode  varchar(3)
countyName  varchar(25)


SELECT t.countyName,
    count(t.countyName) as reAdmits ,count(s.countyName) as totalVisits
FROM (
    SELECT countyName,count(countyName) AS readmitCounts
    FROM (
        SELECT tblPatient.patientID
            ,tblStateCounties.countyName
        FROM tblPatient
        INNER JOIN tblPatientVisits
            ON tblPatient.patientID = tblPatientVisits.patientID
        INNER JOIN tblStateCounties
            ON tblPatientVisits.patientState = tblStateCounties.stateCode
                AND tblPatientVisits.patientCounty = tblStateCounties.countyCode
        GROUP BY tblPatient.patientID
            ,tblStateCounties.stateCode
            ,tblStateCounties.countyName
        HAVING (COUNT(tblPatient.patientID) > 1)
            AND (tblStateCounties.stateCode = '21')
        ) t
    GROUP BY countyname
    ) t
INNER JOIN (
    SELECT countyName
    FROM (
        SELECT tblStateCounties.countyName
            ,COUNT(tblStateCounties.countyName) AS counts
        FROM tblPatient
        INNER JOIN tblPatientVisits
            ON tblPatient.patientID = tblPatientVisits.patientID
        INNER JOIN tblStateCounties
            ON tblPatientVisits.patientState = tblStateCounties.stateCode
                AND tblPatientVisits.patientCounty = tblStateCounties.countyCode
        WHERE (tblStateCounties.stateCode = '21')
        GROUP BY tblStateCounties.countyName
        ) z
    ) s
    ON s.countyName = t.countyName
    group by s.countyname, t.countyname

编辑：我有一个查询，现在运行，但它返回

阅读 192

2021-05-30

共1个答案

小编典典

没有样本数据和理想的结果很难说，但是也许这是您要追求的？

;WITH x AS 
(
  SELECT c.CountyName, v.patientCounty, v.patientState, p.patientID
    FROM dbo.tblPatient AS p
    INNER JOIN dbo.tblPatientVisits AS v
    ON p.patientID = v.patientID 
    INNER JOIN dbo.tblStateCounties AS c 
    ON v.patientState = c.stateCode 
    AND v.patientCounty = c.countyCode
  WHERE c.stateCode = '21'
),
y AS (SELECT CountyName, c = COUNT(*) FROM x GROUP BY CountyName),
z AS (SELECT CountyName, c = COUNT(PatientID) FROM x 
  GROUP BY CountyName, patientState, PatientID HAVING COUNT(*)>1)
SELECT y.countyName, reAdmits = MAX(COALESCE(z.c, 0)), totalVisits = MAX(y.c)
FROM y LEFT OUTER JOIN z
ON y.CountyName = z.CountyName
GROUP BY y.CountyName;

2021-05-30