Tsql 具有多列的订单日期（有些包含空值）

我有4个日期，分别来自下面的子查询，但我想找到返回值的最大和最小日期。 我试过使用CASE，但它不能处理空值。 还尝试在subs中使用COALESCE获得值，然后使用CTE，但这也不起作用

总体查询是查找a1.id中编号为-9的客户

在这方面有很多帮助，但我没有什么可以达到这个目的

任何帮助都将不胜感激。 所需列 PAT_ID日期1日期2日期3日期4最大最小值 1 01/04/2015 25/12/2000 02/02/2011 01/04/2015 25/12/2000 2 05/08/1950 11/11/2011 11/11/2011 05/08/1950 3 04/01/1958 04/01/1958 04/01/1958 4 01/01/1900 01/01/1900 5 2017年8月15日1967年7月7日2017年8月15日1967年7月7日

select distinct 
ca1.id AS PT_ID,

(select Top 1 s1z.appointmen ApptDate
from schl_booking_appoin s1z
LEFT OUTER JOIN core_patient c3z ON s1z.patient = c3z.id 
LEFT OUTER JOIN schl_appt_history_s s2z ON s1z.currentsta = s2z.id 
LEFT OUTER JOIN applookup_instance a2z ON s2z.lkp_status = a2z.id
where (c3z.id = ca1.id and a2z.text not like '%cancelled%' and s1z.appointmen 
> :SYS_DATE_TIME) 
order by s1z.appointmen asc ) AS Date1,

(select Top 1 
s1q.appointmen ApptDate
from schl_booking_appoin s1q 
LEFT OUTER JOIN core_patient c3q ON s1q.patient = c3q.id 
LEFT OUTER JOIN schl_appt_history_s s2q ON s1q.currentsta = s2q.id 
LEFT OUTER JOIN applookup_instance a2q ON s2q.lkp_status = a2q.id
where (c3q.id = ca1.id and a2q.text not like '%cancelled%' and s1q.appointmen         
< :SYS_DATE_TIME) 
order by s1q.appointmen desc ) AS Date2,

(select top 1
CONVERT (VARCHAR(20),c2y.admissiond, 103) AdmissionDate
from core_admissiondetai c2y 
LEFT OUTER JOIN core_pas_event c3y ON c2y.pasevent = c3y.id 
LEFT OUTER JOIN core_patient c4y ON c3y.patient = c4y.id
where (c4y.id = ca1.id) 
order by c2y.admissiond desc ) AS Date3,

(select top 1 
CONVERT(VARCHAR(20),c5k.arrivaldat,103) ArrivalDate
from core_emergencyatten c5k 
LEFT OUTER JOIN core_patient c6k ON c5k.patient = c6k.id
where (c6k.id = ca1.id) 
order by c5k.arrivaldat desc ) AS Date4

from core_patient ca1
LEFT OUTER JOIN core_patient_c_identifi ca2 ON ca1.id = ca2.id 
LEFT OUTER JOIN applookup_instance aa2 ON ca1.lkp_sex = aa2.id 
LEFT OUTER JOIN applookup_instance aa1 ON ca2.lkp_c_ty = aa1.id
LEFT OUTER JOIN applookup_instance ab1 ON ca1.lkp_overseascl = ab1.id
LEFT OUTER JOIN core_organisation cx4 ON ca1.practice = cx4.id

WHERE ca1.id IN 
(
select c1.id core_patient_c1_id 
from core_patient c1 
LEFT OUTER JOIN core_patient_c_identifi c2 ON c1.id = c2.id 
LEFT OUTER JOIN applookup_instance a1 ON c2.lkp_c_ty = a1.id
where ((ca2.merged = 0 or ca2.merged is null) 
and aa1.id = -2404) )


AND ca1.id NOT IN (
select c1.id core_patient_c1_id 
from core_patient c1 
LEFT OUTER JOIN core_patient_c_identifi c2 ON c1.id = c2.id 
LEFT OUTER JOIN applookup_instance a1 ON c2.lkp_c_ty = a1.id
where (c1.namesurname not like '%XXTEST%' 
and c1.namesurname not like '%ZZ%' 
and a1.id = -9)
)

---

您可以执行以下操作：

将您的查询输入CTE； 将数据展平，使其成为PT_ID和日期的列表； 从这些数据中找出每个PT_ID的最大和最小日期； 在最后的一个查询中，将所有这些重新组合在一起。 这是一次尝试，尝试执行上述所有操作：

WITH x AS (
    select distinct 
    ca1.id AS PT_ID,

    (select Top 1 s1z.appointmen ApptDate
    from schl_booking_appoin s1z
    LEFT OUTER JOIN core_patient c3z ON s1z.patient = c3z.id 
    LEFT OUTER JOIN schl_appt_history_s s2z ON s1z.currentsta = s2z.id 
    LEFT OUTER JOIN applookup_instance a2z ON s2z.lkp_status = a2z.id
    where (c3z.id = ca1.id and a2z.text not like '%cancelled%' and s1z.appointmen 
    > :SYS_DATE_TIME) 
    order by s1z.appointmen asc ) AS Date1,

    (select Top 1 
    s1q.appointmen ApptDate
    from schl_booking_appoin s1q 
    LEFT OUTER JOIN core_patient c3q ON s1q.patient = c3q.id 
    LEFT OUTER JOIN schl_appt_history_s s2q ON s1q.currentsta = s2q.id 
    LEFT OUTER JOIN applookup_instance a2q ON s2q.lkp_status = a2q.id
    where (c3q.id = ca1.id and a2q.text not like '%cancelled%' and s1q.appointmen         
    < :SYS_DATE_TIME) 
    order by s1q.appointmen desc ) AS Date2,

    (select top 1
    CONVERT (VARCHAR(20),c2y.admissiond, 103) AdmissionDate
    from core_admissiondetai c2y 
    LEFT OUTER JOIN core_pas_event c3y ON c2y.pasevent = c3y.id 
    LEFT OUTER JOIN core_patient c4y ON c3y.patient = c4y.id
    where (c4y.id = ca1.id) 
    order by c2y.admissiond desc ) AS Date3,

    (select top 1 
    CONVERT(VARCHAR(20),c5k.arrivaldat,103) ArrivalDate
    from core_emergencyatten c5k 
    LEFT OUTER JOIN core_patient c6k ON c5k.patient = c6k.id
    where (c6k.id = ca1.id) 
    order by c5k.arrivaldat desc ) AS Date4

    from core_patient ca1
    LEFT OUTER JOIN core_patient_c_identifi ca2 ON ca1.id = ca2.id 
    LEFT OUTER JOIN applookup_instance aa2 ON ca1.lkp_sex = aa2.id 
    LEFT OUTER JOIN applookup_instance aa1 ON ca2.lkp_c_ty = aa1.id
    LEFT OUTER JOIN applookup_instance ab1 ON ca1.lkp_overseascl = ab1.id
    LEFT OUTER JOIN core_organisation cx4 ON ca1.practice = cx4.id

    WHERE ca1.id IN 
    (
    select c1.id core_patient_c1_id 
    from core_patient c1 
    LEFT OUTER JOIN core_patient_c_identifi c2 ON c1.id = c2.id 
    LEFT OUTER JOIN applookup_instance a1 ON c2.lkp_c_ty = a1.id
    where ((ca2.merged = 0 or ca2.merged is null) 
    and aa1.id = -2404) )


    AND ca1.id NOT IN (
    select c1.id core_patient_c1_id 
    from core_patient c1 
    LEFT OUTER JOIN core_patient_c_identifi c2 ON c1.id = c2.id 
    LEFT OUTER JOIN applookup_instance a1 ON c2.lkp_c_ty = a1.id
    where (c1.namesurname not like '%XXTEST%' 
    and c1.namesurname not like '%ZZ%' 
    and a1.id = -9)
    )),
y AS (
    SELECT PT_ID, Date1 AS [Date] FROM x WHERE Date1 IS NOT NULL
    UNION ALL
    SELECT PT_ID, Date2 AS [Date] FROM x WHERE Date2 IS NOT NULL
    UNION ALL
    SELECT PT_ID, Date3 AS [Date] FROM x WHERE Date3 IS NOT NULL
    UNION ALL
    SELECT PT_ID, Date4 AS [Date] FROM x WHERE Date4 IS NOT NULL),
z AS (
    SELECT
        PT_ID,
        MIN([Date]) AS Min_Date,
        MAX([Date]) AS Max_Date
    FROM
        y
    GROUP BY
        PT_ID)
SELECT
    x.PT_ID,
    x.Date1,
    x.Date2,
    x.Date3,
    x.Date4,
    z.Min_Date,
    z.Max_Date
FROM
    x
    LEFT JOIN z ON z.PT_ID = x.PT_ID;

---

试试这个版本。旧查询充当子查询，并引入新的列定义以获取最大日期

SELECT PT_ID, 
 (
      SELECT Max(v) 
       FROM (VALUES (Date1), (Date2), (Date3),(Date4)) AS value(v) 
   ) as [MaxDate]

FROM
(
select distinct 
ca1.id AS PT_ID,

(select Top 1 s1z.appointmen ApptDate
from schl_booking_appoin s1z
LEFT OUTER JOIN core_patient c3z ON s1z.patient = c3z.id 
LEFT OUTER JOIN schl_appt_history_s s2z ON s1z.currentsta = s2z.id 
LEFT OUTER JOIN applookup_instance a2z ON s2z.lkp_status = a2z.id
where (c3z.id = ca1.id and a2z.text not like '%cancelled%' and s1z.appointmen 
> :SYS_DATE_TIME) 
order by s1z.appointmen asc ) AS Date1,

(select Top 1 
s1q.appointmen ApptDate
from schl_booking_appoin s1q 
LEFT OUTER JOIN core_patient c3q ON s1q.patient = c3q.id 
LEFT OUTER JOIN schl_appt_history_s s2q ON s1q.currentsta = s2q.id 
LEFT OUTER JOIN applookup_instance a2q ON s2q.lkp_status = a2q.id
where (c3q.id = ca1.id and a2q.text not like '%cancelled%' and s1q.appointmen         
< :SYS_DATE_TIME) 
order by s1q.appointmen desc ) AS Date2,

(select top 1
CONVERT (VARCHAR(20),c2y.admissiond, 103) AdmissionDate
from core_admissiondetai c2y 
LEFT OUTER JOIN core_pas_event c3y ON c2y.pasevent = c3y.id 
LEFT OUTER JOIN core_patient c4y ON c3y.patient = c4y.id
where (c4y.id = ca1.id) 
order by c2y.admissiond desc ) AS Date3,

(select top 1 
CONVERT(VARCHAR(20),c5k.arrivaldat,103) ArrivalDate
from core_emergencyatten c5k 
LEFT OUTER JOIN core_patient c6k ON c5k.patient = c6k.id
where (c6k.id = ca1.id) 
order by c5k.arrivaldat desc ) AS Date4

from core_patient ca1
LEFT OUTER JOIN core_patient_c_identifi ca2 ON ca1.id = ca2.id 
LEFT OUTER JOIN applookup_instance aa2 ON ca1.lkp_sex = aa2.id 
LEFT OUTER JOIN applookup_instance aa1 ON ca2.lkp_c_ty = aa1.id
LEFT OUTER JOIN applookup_instance ab1 ON ca1.lkp_overseascl = ab1.id
LEFT OUTER JOIN core_organisation cx4 ON ca1.practice = cx4.id

WHERE ca1.id IN 
(
select c1.id core_patient_c1_id 
from core_patient c1 
LEFT OUTER JOIN core_patient_c_identifi c2 ON c1.id = c2.id 
LEFT OUTER JOIN applookup_instance a1 ON c2.lkp_c_ty = a1.id
where ((ca2.merged = 0 or ca2.merged is null) 
and aa1.id = -2404) )


AND ca1.id NOT IN (
select c1.id core_patient_c1_id 
from core_patient c1 
LEFT OUTER JOIN core_patient_c_identifi c2 ON c1.id = c2.id 
LEFT OUTER JOIN applookup_instance a1 ON c2.lkp_c_ty = a1.id
where (c1.namesurname not like '%XXTEST%' 
and c1.namesurname not like '%ZZ%' 
and a1.id = -9)
)

)Sub

---

谢谢你，这只是票！我从来没有想过这样使用它，我尝试了多种方法，每种方法都会导致不同的问题。如果结果返回空值，有没有办法排除它们？嗨，斯科蒂，我假设你指的是所有四个日期都为空的地方。然后您可以添加where子句：where COALESCEDate1、Date2、Date3、Date4不为NULL