Question

我正在尝试学习一些先进的技术。我有以下内容从'（日期）'开始执行每月退出信息的查询与union all s。

有没有更短的方法呢？执行此操作需要很长时间时间。

谢谢！

select left((datename(mm, me.StateDisenrollDate)),3) as ReportedMonth,
me.StateDisenrollDate,
me.ReinstatementDate,
me.MemberID,
dis.DRI_Name,
case
    when me.ReinstatementDate is null then 'Disenrolled'
    else 'Reinstated' end as Status
from tblMemEnrollment me
left join tlkpDisenrolReasInvestigated dis on dis.DisenrolReasInvestigID = me.DisenrolRsnInvstgtdID
where me.StateDisenrollDate between '1-1-2015' and '1/31/2015'
and me.ReinstatementDate is null or me.ReinstatementDate between '1/1/2015' and '1/31/2015'
and SubscriberID like '%H%'

union all

select left((datename(mm, me.StateDisenrollDate)),3) as ReportedMonth,
me.StateDisenrollDate,
me.ReinstatementDate,
me.MemberID,
dis.DRI_Name,
case
    when me.ReinstatementDate is null then 'Disenrolled'
    else 'Reinstated' end as Status
from tblMemEnrollment me
left join tlkpDisenrolReasInvestigated dis on dis.DisenrolReasInvestigID = me.DisenrolRsnInvstgtdID
where me.StateDisenrollDate between '2-1-2015' and '2/28/2015'
and me.ReinstatementDate is null or me.ReinstatementDate between '2/1/2015' and '2/28/2015'
and SubscriberID like '%H%'

union all

select left((datename(mm, me.StateDisenrollDate)),3) as ReportedMonth,
me.StateDisenrollDate,
me.ReinstatementDate,
me.MemberID,
dis.DRI_Name,
case
    when me.ReinstatementDate is null then 'Disenrolled'
    else 'Reinstated' end as Status
from tblMemEnrollment me
left join tlkpDisenrolReasInvestigated dis on dis.DisenrolReasInvestigID = me.DisenrolRsnInvstgtdID
where me.StateDisenrollDate between '3-1-2015' and '3/31/2015' 
and me.ReinstatementDate is null or me.ReinstatementDate between '3/1/2015' and '3/31/2015'
and SubscriberID like '%H%'


union all

select left((datename(mm, me.StateDisenrollDate)),3) as ReportedMonth,
me.StateDisenrollDate,
me.ReinstatementDate,
me.MemberID,
dis.DRI_Name,
case
    when me.ReinstatementDate is null then 'Disenrolled'
    else 'Reinstated' end as Status
from tblMemEnrollment me
left join tlkpDisenrolReasInvestigated dis on dis.DisenrolReasInvestigID = me.DisenrolRsnInvstgtdID
where me.StateDisenrollDate between '4/1/2015' and '4/30/2015'
and me.ReinstatementDate is null or me.ReinstatementDate between '4/1/2015' and '4/30/2015'
and SubscriberID like '%H%'


union all

select left((datename(mm, me.StateDisenrollDate)),3) as ReportedMonth,
me.StateDisenrollDate,
me.ReinstatementDate,
me.MemberID,
dis.DRI_Name,
case
    when me.ReinstatementDate is null then 'Disenrolled'
    else 'Reinstated' end as Status
from tblMemEnrollment me
left join tlkpDisenrolReasInvestigated dis on dis.DisenrolReasInvestigID = me.DisenrolRsnInvstgtdID
where me.StateDisenrollDate between '5-1-2015' and getdate()
and me.ReinstatementDate is null or me.ReinstatementDate between '5/1/2015' and getdate()
and SubscriberID like '%H%'

Answer 1

你有相同的列列表和相同的连接，只是不同的WHERE条件，所以只需使用OR组合它们：

SELECT LEFT((datename(mm, me.StateDisenrollDate)),3) AS ReportedMonth,
me.StateDisenrollDate,
me.ReinstatementDate,
me.MemberID,
dis.DRI_Name,
CASE
    WHEN me.ReinstatementDate IS NULL THEN 'Disenrolled'
    ELSE 'Reinstated' end AS Status
FROM tblMemEnrollment me
LEFT JOIN tlkpDisenrolReasInvestigated dis ON dis.DisenrolReasInvestigID = me.DisenrolRsnInvstgtdID
WHERE (me.StateDisenrollDate BETWEEN '1-1-2015' AND '1/31/2015'
AND me.ReinstatementDate IS NULL OR me.ReinstatementDate BETWEEN '1/1/2015' AND '1/31/2015'
AND SubscriberID LIKE '%H%')
 OR   ( me.StateDisenrollDate BETWEEN '2-1-2015' AND '2/28/2015'
AND me.ReinstatementDate IS NULL OR me.ReinstatementDate BETWEEN '2/1/2015' AND '2/28/2015'
AND SubscriberID LIKE '%H%')
 OR   ( me.StateDisenrollDate BETWEEN '3-1-2015' AND '3/31/2015' 
AND me.ReinstatementDate IS NULL OR me.ReinstatementDate BETWEEN '3/1/2015' AND '3/31/2015'
AND SubscriberID LIKE '%H%')
 OR   ( me.StateDisenrollDate BETWEEN '4/1/2015' AND '4/30/2015'
AND me.ReinstatementDate IS NULL OR me.ReinstatementDate BETWEEN '4/1/2015' AND '4/30/2015'
AND SubscriberID LIKE '%H%')
 OR   ( me.StateDisenrollDate BETWEEN '5-1-2015' AND getdate()
AND me.ReinstatementDate IS NULL OR me.ReinstatementDate BETWEEN '5/1/2015' AND getdate()
AND SubscriberID LIKE '%H%')

但我敢打赌，这不是正确的结果，你在没有括号的情况下混合AND和OR。提示：优先顺序先是AND，然后是OR。

Answer 2

你说你想分成一年中的每个月，但你根本没有进行任何聚合或计算，只列出一组结果。

您可以将where子句合并为一个（并更改检查两个日期的月份和年份相同的位置）？

select left((datename(mm, me.StateDisenrollDate)),3) as ReportedMonth,
me.StateDisenrollDate,
me.ReinstatementDate,
me.MemberID,
dis.DRI_Name,
case
    when me.ReinstatementDate is null then 'Disenrolled'
    else 'Reinstated' end as Status
from tblMemEnrollment me
left join tlkpDisenrolReasInvestigated dis on dis.DisenrolReasInvestigID = me.DisenrolRsnInvstgtdID
where SubscriberID like '%H%'
AND ((DATEPART(month, me.StateDisenrollDate) = DATEPART(month, me.ReinstatementDate)
AND DATEPART(year, me.StateDisenrollDate) = DATEPART(year, me.ReinstatementDate))
OR me.ReinstatementDate is null)

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2 个答案: