SQL 查询产生计数和平均值

Question

我有两个问题。一个产生特定过程类型的记录总数。另一个按物种产生该特定程序的记录数

我试图弄清楚如何获取并获得每种特定程序类型的计数和平均数。

按过程类型查询产生总数：

/* The following query will show the total number of studies by imaging area. */
SELECT 
    PlacerFld2 AS "Type of Procedure", Count(*) AS "Count of Procedures"
FROM 
    [order] o
WHERE 
    lastmodifieddate BETWEEN '2017-01-01 00:00:00' AND '2017-12-31 23:59:59'
    AND SiteBridgeID = '1' /* Medical Imaging */
    AND OrderStatusID <> '4'
    AND placerfld2 IN ('CARD', 'CARM', 'CRFL', 'CT', 'I131', 'LACR', 'LAUS', 'NUCMED','OUTFM','PCCR','PETCT','PETR','PHMR','SACR','SAES','SAMR','SAUS','VRC','VRUS')
GROUP BY 
    PlacerFld2
ORDER BY 
    PlacerFld2 ASC

示例输出：

CT    2056
SAMR  1800
SACR  3600

查询产生的程序总数（按物种）

/* The following query will break down the number of studies by species */
SELECT PlacerFld2 AS "Type of Procedure", City AS Species, Count(*) AS "Count of Procedures"
FROM [order] o

LEFT JOIN Visit v
ON o.VisitID = v.VisitID

LEFT JOIN PatientInfo pif
ON v.PatientID = pif.PatientID

LEFT JOIN Patient p
ON pif.PatientID = p.PatientID

LEFT JOIN PersonalInfo perinfo
ON p.PersonalInfoID = perinfo.PersonalInfoID

WHERE o.lastmodifieddate between '2017-01-01 00:00:00' AND '2017-12-31 23:59:59'
AND SiteBridgeID = '1' /* Medical Imaging */
AND OrderStatusID <> '4'
AND placerfld2 IN ('CARD','CARM','CRFL','CT','I131','LACR','LAUS','NUCMED','OUTFM','PCCR','PETCT','PETR','PHMR','SACR','SAES','SAMR','SAUS','VRC','VRUS')

GROUP BY Placerfld2, CITY
ORDER BY placerfld2 ASC, CITY ASC

示例表输出：

CT    CANINE   1500
CT    FELINE   556
SAMR  CANINE   1000
SAMR  FELINE   600
SAMR  EQUINE   200

期望的结果：

CT    CANINE   1500   72.9%
CT    FELINE   556    27.1%
SAMR  CANINE   1000   55.5%
SAMR  FELINE   600    33.3%
SAMR  EQUINE   200    11.1%

Answer 1

你可以使用窗口函数：

with cte as (<your query here with no order by>)
select col1, col2, col3,
       col3 * 100.0 / sum(col3) over (partition by col1) as percentage
from cte;

Answer 2

如果您不能选择公用表表达式（因为它们不受支持，或者您只是不喜欢它们），您可以通过子查询来实现：

/* The following query will break down the number of studies by species */
SELECT PlacerFld2 AS "Type of Procedure", City AS Species, Count(*) AS "Count of Procedures", COUNT(*) / x.[Count of Procedures] AS "Percentage"
FROM [order] o

LEFT JOIN Visit v
ON o.VisitID = v.VisitID

LEFT JOIN PatientInfo pif
ON v.PatientID = pif.PatientID

LEFT JOIN Patient p
ON pif.PatientID = p.PatientID

LEFT JOIN PersonalInfo perinfo
ON p.PersonalInfoID = perinfo.PersonalInfoID

LEFT JOIN (
    /* The following query will show the total number of studies by imaging area. */
    SELECT 
        PlacerFld2 AS "Type of Procedure", Count(*) AS "Count of Procedures"
    FROM 
        [order] o
    WHERE 
        lastmodifieddate BETWEEN '2017-01-01 00:00:00' AND '2017-12-31 23:59:59'
        AND SiteBridgeID = '1' /* Medical Imaging */
        AND OrderStatusID <> '4'
        AND placerfld2 IN ('CARD', 'CARM', 'CRFL', 'CT', 'I131', 'LACR', 'LAUS', 'NUCMED','OUTFM','PCCR','PETCT','PETR','PHMR','SACR','SAES','SAMR','SAUS','VRC','VRUS')
    GROUP BY 
        PlacerFld2) x ON x.[Type of Procedure] = PlacerFld2
--ORDER BY 
--    PlacerFld2 ASC

WHERE o.lastmodifieddate between '2017-01-01 00:00:00' AND '2017-12-31 23:59:59'
AND SiteBridgeID = '1' /* Medical Imaging */
AND OrderStatusID <> '4'
AND placerfld2 IN ('CARD','CARM','CRFL','CT','I131','LACR','LAUS','NUCMED','OUTFM','PCCR','PETCT','PETR','PHMR','SACR','SAES','SAMR','SAUS','VRC','VRUS')

GROUP BY Placerfld2, CITY, x.[Count of Procedures]
ORDER BY placerfld2 ASC, CITY ASC

这里的基本模式是：

SELECT... <your detail query>
FROM
    <your original detail tables>
    LEFT JOIN (<your summary query>) x ON x.<a field> = <original field>
WHERE.... <the rest of your detail query>
GROUP BY... <remember to add the new summary total to the GROUP BY clause>