SQL 服务器查询以根据传递关系查找最小日期
SQL Server Query to find min date based on transitive relationship
运行 对这个查询有点头疼，一些 hints/suggestions 将不胜感激。我找不到任何与我的问题真正相关的东西——我发现了一些关于传递闭包的东西，这不是我所需要的，因为我的数据可能会创建一个 loop/cycle，我认为这会导致递归调用无限循环。
假设我有两个基本 table，数据显示在它们下方。全面披露：Memberships table 是一个 CTE，它已经做了相当多的逻辑来计算 CServiceDate 列值。 Transfers table 是一个实际的 table，除了 PK 和 FromMembershipID 和ToMembershipID 关系。
会员资格
+==========+==============+================+==============+
| PersonID | MemberShipID | MembershipDate | CServiceDate |
+==========+==============+================+==============+
| 1 | 15 | Aug-01-2016 | Aug-27-2017 |
+----------+--------------+----------------+--------------+
| 1 | 16 | Mar-25-2016 | Sep-01-2000 |
+----------+--------------+----------------+--------------+
| 1 | 17 | Dec-06-2011 | May-15-1995 |
+----------+--------------+----------------+--------------+
| 1 | 18 | Jan-12-2009 | Feb-28-1998 |
+----------+--------------+----------------+--------------+
| 1 | 19 | Apr-08-2016 | Jul-10-1994 |
+----------+--------------+----------------+--------------+
| 1 | 20 | Jun-11-2010 | Nov-12-1997 |
+----------+--------------+----------------+--------------+
转会
+=====+=====+==================+================+
| TID | PID | FromMembershipID | ToMembershipID |
+=====+=====+==================+================+
| 1 | 1 | 16 | 15 |
+-----+-----+------------------+----------------+
| 2 | 1 | 18 | 17 |
+-----+-----+------------------+----------------+
| 3 | 1 | 19 | 17 |
+-----+-----+------------------+----------------+
| 4 | 1 | 20 | 18 |
+-----+-----+------------------+----------------+
| 5 | 1 | 20 | 19 |
+-----+-----+------------------+----------------+
问题
我需要查询的是 Memberships CTE 中的每一行（即每个 MembershipID），我想 return 所有相关 MembershipID 的 MIN CServiceDate。我将此最小值称为 ECSD（预期信用服务日期）。 ECSD的计算只有两个条件：
- 如果会员记录通过 Transfers table 通过查看FromMembershipID 和 ToMembershipID 列。例如对于 MembershipID 20，如果我们查看 Transfers table，我们可以看到 MembershipID 20、19、18 和 17 都是通过传递性相关的（此外：通过 Transfers table，我们可以看到MembershipIDs 15和16相互关联，但与[20,19,18,17] )
无关
- 在上面直接派生的传递相关的成员资格列表中，在计算 ECSD 时在传递关系列表中可以考虑的唯一成员资格是 MembershipDate 早于当前 MembershipID 的成员资格。例如根据给定 MembershipID 的 MembershipDates 和 Transfers table，如果查看 MembershipID 17，则在计算 MembershiID 17 的 ECSD 时不能考虑 MembershipID 19，因为 MembershipID 19 具有MembershipDate (Apr-08-2016) 不早于 MembershipID 17 (Dec-06-2011)
ECSD 列的预期产出
+==========+==============+================+==============+=============+
| PersonID | MemberShipID | MembershipDate | CServiceDate | ECSD |
+==========+==============+================+==============+=============+
| 1 | 15 | Aug-01-2016 | Aug-27-2017 | Sep-01-2000 |
+----------+--------------+----------------+--------------+-------------+
| 1 | 16 | Mar-25-2016 | Sep-01-2000 | Sep-01-2000 |
+----------+--------------+----------------+--------------+-------------+
| 1 | 17 | Dec-06-2011 | May-15-1995 | May-15-1995 |
+----------+--------------+----------------+--------------+-------------+
| 1 | 18 | Jan-12-2009 | Feb-28-1998 | Feb-28-1998 |
+----------+--------------+----------------+--------------+-------------+
| 1 | 19 | Apr-08-2016 | Jul-10-1994 | Jul-10-1994 |
+----------+--------------+----------------+--------------+-------------+
| 1 | 20 | Jun-11-2010 | Nov-12-1997 | Nov-12-1997 |
+----------+--------------+----------------+--------------+-------------+
请注意：
- MembershipID 可以在 FromMembershipID 和 ToMembershipID 列中出现多次。这些列值不必是唯一的。
- 上面提供的table是简单的关系。 Memberships/Transfers 可以低至 1 层深度（即 1 次传输）到 N 层深度，其中传输（如果仅查看 From/ToMembershipIDs）可以创建循环。下面是一个具有更深层次传输关系的示例。
- 如果 TOMembershipID 列中不存在 MembershipID，则该 MembershipID 是最早的（可能不止一个），这可能会有所帮助。同样，如果 FromMembershipID 列中不存在 MembershipID，则它是结束的和最新的成员资格。
- 对于给定的人，可能存在将某些成员资格关联在一起的区块或转移集，但不是全部。
示例 2
会员资格
+==========+==============+================+==============+
| personid | membershipid | membershipdate | CServiceDate |
+==========+==============+================+==============+
| 499510 | 548426 | 2014-09-29 | 2014-09-29 |
+----------+--------------+----------------+--------------+
| 499510 | 548428 | 2014-01-29 | 2014-01-29 |
+----------+--------------+----------------+--------------+
| 499510 | 548425 | 2012-05-28 | 2012-05-28 |
+----------+--------------+----------------+--------------+
| 499510 | 548429 | 2011-11-23 | 2011-11-23 |
+----------+--------------+----------------+--------------+
| 499510 | 548427 | 2008-07-03 | 2008-07-03 |
+----------+--------------+----------------+--------------+
| 499510 | 548431 | 2001-05-01 | 1976-01-01 |
+----------+--------------+----------------+--------------+
| 499510 | 548430 | 1998-10-08 | 1998-10-08 |
+----------+--------------+----------------+--------------+
转会
+=======+========+==================+================+
| tid | pid | FromMembershipID | ToMembershipID |
+=======+========+==================+================+
| 10664 | 499510 | 548430 | 548431 |
+-------+--------+------------------+----------------+
| 10665 | 499510 | 548431 | 548427 |
+-------+--------+------------------+----------------+
| 10666 | 499510 | 548427 | 548429 |
+-------+--------+------------------+----------------+
| 10667 | 499510 | 548429 | 548425 |
+-------+--------+------------------+----------------+
| 10668 | 499510 | 548425 | 548428 |
+-------+--------+------------------+----------------+
| 10669 | 499510 | 548428 | 548426 |
+-------+--------+------------------+----------------+
| 13085 | 499510 | 548430 | 548427 |
+-------+--------+------------------+----------------+
| 13086 | 499510 | 548427 | 548425 |
+-------+--------+------------------+----------------+
| 13087 | 499510 | 548425 | 548426 |
+-------+--------+------------------+----------------+
| 13088 | 499510 | 548431 | 548429 |
+-------+--------+------------------+----------------+
| 13089 | 499510 | 548429 | 548428 |
+-------+--------+------------------+----------------+
预期结果
+==========+==============+================+==============+============+
| personid | membershipid | membershipdate | CServiceDate | ECSD |
+==========+==============+================+==============+============+
| 499510 | 548426 | 2014-09-29 | 2014-09-29 | 1976-01-01 |
+----------+--------------+----------------+--------------+------------+
| 499510 | 548428 | 2014-01-29 | 2014-01-29 | 1976-01-01 |
+----------+--------------+----------------+--------------+------------+
| 499510 | 548425 | 2012-05-28 | 2012-05-28 | 1976-01-01 |
+----------+--------------+----------------+--------------+------------+
| 499510 | 548429 | 2011-11-23 | 2011-11-23 | 1976-01-01 |
+----------+--------------+----------------+--------------+------------+
| 499510 | 548427 | 2008-07-03 | 2008-07-03 | 1976-01-01 |
+----------+--------------+----------------+--------------+------------+
| 499510 | 548431 | 2001-05-01 | 1976-01-01 | 1976-01-01 |
+----------+--------------+----------------+--------------+------------+
| 499510 | 548430 | 1998-10-08 | 1998-10-08 | 1998-10-08 |
+----------+--------------+----------------+--------------+------------+
谢谢！
这是一种使用 CTE 编译传递关系列表的方法。一个 CTE 递归地定义从 FromMembershipID 到 ToMembershipID 的关系。第二个 CTE 在相反的方向做同样的事情 - 这样，您可以将结果组合到第三个 CTE 中，列出成员之间的每个传递关系。
例如，在第一个结果集中，20 => 19 和 19 => 17，反过来，17 => 19 和 19 => 20，所以你得到：
20 19
20 17
19 17
17 19
17 20
19 20
然后您可以使用该列表传递关系来按成员资格获取最小 CServiceDate。
这为两组示例数据提供了正确的输出。如果您有更多数据，您可能 运行 进入 100 级递归限制，但您可以对其进行配置。或者找到更好的解决方案 :) 但从技术上讲，这是可行的：
;with cte_trans_relationships (frommembershipid, tomembershipid)
as
(
select frommembershipid, tomembershipid
from @transfer
union all
select c.frommembershipid, t.tomembershipid
from cte_trans_relationships c
inner join @transfer t on c.tomembershipid = t.frommembershipid
),
cte_trans_relationships2 (tomembershipid, frommembershipid)
as
(
select tomembershipid, frommembershipid
from @transfer
union all
select c.tomembershipid, t.frommembershipid
from cte_trans_relationships c
inner join @transfer t on c.frommembershipid = t.tomembershipid
),
cte_trans_all (m1, m2)
as
(
select distinct frommembershipid m1, tomembershipid m2
from cte_trans_relationships c
union
select distinct tomembershipid, frommembershipid
from cte_trans_relationships2 c2
)
select m.personid, m.membershipid, m.membershipdate, m.cservicedate,
case when sq.cservicedate < cservicedate1 and sq.cservicedate < cservicedate2 then sq.cservicedate
when cservicedate1 < sq.cservicedate and cservicedate1 < cservicedate2 then cservicedate1
else cservicedate2 end as ECSD
from @memberships m
inner join
(
select m.personid, m.membershipid, isnull(m.cservicedate, dateadd(year, 100, getdate())) as cservicedate,
isnull(min(m1.cservicedate), dateadd(year, 100, getdate())) as cservicedate1,
isnull(min(m2.cservicedate), dateadd(year, 100, getdate())) as cservicedate2
from @memberships m
left join cte_trans_all sq_trans1 on m.membershipid = sq_trans1.m1
left join @memberships m1 on sq_trans1.m2 = m1.membershipid and m1.membershipdate < m.membershipdate
left join cte_trans_all sq_trans2 on m.membershipid = sq_trans2.m1
left join @memberships m2 on sq_trans2.m2 = m2.membershipid and m2.membershipdate < m.membershipdate
group by m.personid, m.membershipid, m.cservicedate
)sq on m.personid = sq.personid and m.membershipid = sq.membershipid
以下是用于测试的示例 DDL/DML 语句：
declare @memberships table (personid int, membershipid int, membershipdate datetime, cservicedate datetime)
insert into @memberships values (1, 15, '8/1/2016', '8/27/2017')
insert into @memberships values (1, 16, '3/25/2016', '9/1/2000')
insert into @memberships values (1, 17, '12/6/2011', '5/15/1995')
insert into @memberships values (1, 18, '1/12/2009', '2/28/1998')
insert into @memberships values (1, 19, '4/8/2016', '7/10/1994')
insert into @memberships values (1, 20, '6/11/2010', '11/12/1997')
--insert into @memberships values (499510, 548426, '9/29/2014', '9/29/2014')
--insert into @memberships values (499510, 548428, '1/29/2014', '1/29/2014')
--insert into @memberships values (499510, 548425, '5/28/2012', '5/28/2012')
--insert into @memberships values (499510, 548429, '11/23/2011', '11/23/2011')
--insert into @memberships values (499510, 548427, '7/3/2008', '7/3/2008')
--insert into @memberships values (499510, 548431, '5/1/2001', '1/1/1976')
--insert into @memberships values (499510, 548430, '10/8/1998', '10/8/1998')
declare @transfer table (tid int, pid int, frommembershipid int, tomembershipid int)
insert into @transfer values (1, 1, 16, 15)
insert into @transfer values (2, 1, 18, 17)
insert into @transfer values (3, 1, 19, 17)
insert into @transfer values (4, 1, 20, 18)
insert into @transfer values (5, 1, 20, 19)
--insert into @transfer values (10664, 499510, 548430, 548431)
--insert into @transfer values (10665, 499510, 548431, 548427)
--insert into @transfer values (10666, 499510, 548427, 548429)
--insert into @transfer values (10667, 499510, 548429, 548425)
--insert into @transfer values (10668, 499510, 548425, 548428)
--insert into @transfer values (10669, 499510, 548428, 548426)
--insert into @transfer values (13085, 499510, 548430, 548427)
--insert into @transfer values (13086, 499510, 548427, 548425)
--insert into @transfer values (13087, 499510, 548425, 548426)
--insert into @transfer values (13088, 499510, 548431, 548429)
--insert into @transfer values (13089, 499510, 548429, 548428)
这是 2 个结果集：
personid membershipid membershipdate cservicedate ECSD
1 15 2016-08-01 2017-08-27 2000-09-01
1 16 2016-03-25 2000-09-01 2000-09-01
1 17 2011-12-06 1995-05-15 1995-05-15
1 18 2009-01-12 1998-02-28 1998-02-28
1 19 2016-04-08 1994-07-10 1994-07-10
1 20 2010-06-11 1997-11-12 1997-11-12
personid membershipid membershipdate cservicedate ECSD
499510 548425 2012-05-28 2012-05-28 1976-01-01
499510 548426 2014-09-29 2014-09-29 1976-01-01
499510 548427 2008-07-03 2008-07-03 1976-01-01
499510 548428 2014-01-29 2014-01-29 1976-01-01
499510 548429 2011-11-23 2011-11-23 1976-01-01
499510 548430 1998-10-08 1998-10-08 1998-10-08
499510 548431 2001-05-01 1976-01-01 1976-01-01
运行 对这个查询有点头疼，一些 hints/suggestions 将不胜感激。我找不到任何与我的问题真正相关的东西——我发现了一些关于传递闭包的东西，这不是我所需要的，因为我的数据可能会创建一个 loop/cycle，我认为这会导致递归调用无限循环。
假设我有两个基本 table，数据显示在它们下方。全面披露：Memberships table 是一个 CTE，它已经做了相当多的逻辑来计算 CServiceDate 列值。 Transfers table 是一个实际的 table，除了 PK 和 FromMembershipID 和ToMembershipID 关系。
会员资格
+==========+==============+================+==============+ | PersonID | MemberShipID | MembershipDate | CServiceDate | +==========+==============+================+==============+ | 1 | 15 | Aug-01-2016 | Aug-27-2017 | +----------+--------------+----------------+--------------+ | 1 | 16 | Mar-25-2016 | Sep-01-2000 | +----------+--------------+----------------+--------------+ | 1 | 17 | Dec-06-2011 | May-15-1995 | +----------+--------------+----------------+--------------+ | 1 | 18 | Jan-12-2009 | Feb-28-1998 | +----------+--------------+----------------+--------------+ | 1 | 19 | Apr-08-2016 | Jul-10-1994 | +----------+--------------+----------------+--------------+ | 1 | 20 | Jun-11-2010 | Nov-12-1997 | +----------+--------------+----------------+--------------+
转会
+=====+=====+==================+================+ | TID | PID | FromMembershipID | ToMembershipID | +=====+=====+==================+================+ | 1 | 1 | 16 | 15 | +-----+-----+------------------+----------------+ | 2 | 1 | 18 | 17 | +-----+-----+------------------+----------------+ | 3 | 1 | 19 | 17 | +-----+-----+------------------+----------------+ | 4 | 1 | 20 | 18 | +-----+-----+------------------+----------------+ | 5 | 1 | 20 | 19 | +-----+-----+------------------+----------------+
问题 我需要查询的是 Memberships CTE 中的每一行（即每个 MembershipID），我想 return 所有相关 MembershipID 的 MIN CServiceDate。我将此最小值称为 ECSD（预期信用服务日期）。 ECSD的计算只有两个条件：
- 如果会员记录通过 Transfers table 通过查看FromMembershipID 和 ToMembershipID 列。例如对于 MembershipID 20，如果我们查看 Transfers table，我们可以看到 MembershipID 20、19、18 和 17 都是通过传递性相关的（此外：通过 Transfers table，我们可以看到MembershipIDs 15和16相互关联，但与[20,19,18,17] ) 无关
- 在上面直接派生的传递相关的成员资格列表中，在计算 ECSD 时在传递关系列表中可以考虑的唯一成员资格是 MembershipDate 早于当前 MembershipID 的成员资格。例如根据给定 MembershipID 的 MembershipDates 和 Transfers table，如果查看 MembershipID 17，则在计算 MembershiID 17 的 ECSD 时不能考虑 MembershipID 19，因为 MembershipID 19 具有MembershipDate (Apr-08-2016) 不早于 MembershipID 17 (Dec-06-2011)
ECSD 列的预期产出
+==========+==============+================+==============+=============+ | PersonID | MemberShipID | MembershipDate | CServiceDate | ECSD | +==========+==============+================+==============+=============+ | 1 | 15 | Aug-01-2016 | Aug-27-2017 | Sep-01-2000 | +----------+--------------+----------------+--------------+-------------+ | 1 | 16 | Mar-25-2016 | Sep-01-2000 | Sep-01-2000 | +----------+--------------+----------------+--------------+-------------+ | 1 | 17 | Dec-06-2011 | May-15-1995 | May-15-1995 | +----------+--------------+----------------+--------------+-------------+ | 1 | 18 | Jan-12-2009 | Feb-28-1998 | Feb-28-1998 | +----------+--------------+----------------+--------------+-------------+ | 1 | 19 | Apr-08-2016 | Jul-10-1994 | Jul-10-1994 | +----------+--------------+----------------+--------------+-------------+ | 1 | 20 | Jun-11-2010 | Nov-12-1997 | Nov-12-1997 | +----------+--------------+----------------+--------------+-------------+
请注意：
- MembershipID 可以在 FromMembershipID 和 ToMembershipID 列中出现多次。这些列值不必是唯一的。
- 上面提供的table是简单的关系。 Memberships/Transfers 可以低至 1 层深度（即 1 次传输）到 N 层深度，其中传输（如果仅查看 From/ToMembershipIDs）可以创建循环。下面是一个具有更深层次传输关系的示例。
- 如果 TOMembershipID 列中不存在 MembershipID，则该 MembershipID 是最早的（可能不止一个），这可能会有所帮助。同样，如果 FromMembershipID 列中不存在 MembershipID，则它是结束的和最新的成员资格。
- 对于给定的人，可能存在将某些成员资格关联在一起的区块或转移集，但不是全部。
示例 2
会员资格
+==========+==============+================+==============+ | personid | membershipid | membershipdate | CServiceDate | +==========+==============+================+==============+ | 499510 | 548426 | 2014-09-29 | 2014-09-29 | +----------+--------------+----------------+--------------+ | 499510 | 548428 | 2014-01-29 | 2014-01-29 | +----------+--------------+----------------+--------------+ | 499510 | 548425 | 2012-05-28 | 2012-05-28 | +----------+--------------+----------------+--------------+ | 499510 | 548429 | 2011-11-23 | 2011-11-23 | +----------+--------------+----------------+--------------+ | 499510 | 548427 | 2008-07-03 | 2008-07-03 | +----------+--------------+----------------+--------------+ | 499510 | 548431 | 2001-05-01 | 1976-01-01 | +----------+--------------+----------------+--------------+ | 499510 | 548430 | 1998-10-08 | 1998-10-08 | +----------+--------------+----------------+--------------+
转会
+=======+========+==================+================+ | tid | pid | FromMembershipID | ToMembershipID | +=======+========+==================+================+ | 10664 | 499510 | 548430 | 548431 | +-------+--------+------------------+----------------+ | 10665 | 499510 | 548431 | 548427 | +-------+--------+------------------+----------------+ | 10666 | 499510 | 548427 | 548429 | +-------+--------+------------------+----------------+ | 10667 | 499510 | 548429 | 548425 | +-------+--------+------------------+----------------+ | 10668 | 499510 | 548425 | 548428 | +-------+--------+------------------+----------------+ | 10669 | 499510 | 548428 | 548426 | +-------+--------+------------------+----------------+ | 13085 | 499510 | 548430 | 548427 | +-------+--------+------------------+----------------+ | 13086 | 499510 | 548427 | 548425 | +-------+--------+------------------+----------------+ | 13087 | 499510 | 548425 | 548426 | +-------+--------+------------------+----------------+ | 13088 | 499510 | 548431 | 548429 | +-------+--------+------------------+----------------+ | 13089 | 499510 | 548429 | 548428 | +-------+--------+------------------+----------------+
预期结果
+==========+==============+================+==============+============+ | personid | membershipid | membershipdate | CServiceDate | ECSD | +==========+==============+================+==============+============+ | 499510 | 548426 | 2014-09-29 | 2014-09-29 | 1976-01-01 | +----------+--------------+----------------+--------------+------------+ | 499510 | 548428 | 2014-01-29 | 2014-01-29 | 1976-01-01 | +----------+--------------+----------------+--------------+------------+ | 499510 | 548425 | 2012-05-28 | 2012-05-28 | 1976-01-01 | +----------+--------------+----------------+--------------+------------+ | 499510 | 548429 | 2011-11-23 | 2011-11-23 | 1976-01-01 | +----------+--------------+----------------+--------------+------------+ | 499510 | 548427 | 2008-07-03 | 2008-07-03 | 1976-01-01 | +----------+--------------+----------------+--------------+------------+ | 499510 | 548431 | 2001-05-01 | 1976-01-01 | 1976-01-01 | +----------+--------------+----------------+--------------+------------+ | 499510 | 548430 | 1998-10-08 | 1998-10-08 | 1998-10-08 | +----------+--------------+----------------+--------------+------------+
谢谢！
这是一种使用 CTE 编译传递关系列表的方法。一个 CTE 递归地定义从 FromMembershipID 到 ToMembershipID 的关系。第二个 CTE 在相反的方向做同样的事情 - 这样，您可以将结果组合到第三个 CTE 中，列出成员之间的每个传递关系。
例如，在第一个结果集中，20 => 19 和 19 => 17，反过来，17 => 19 和 19 => 20，所以你得到：
20 19
20 17
19 17
17 19
17 20
19 20
然后您可以使用该列表传递关系来按成员资格获取最小 CServiceDate。
这为两组示例数据提供了正确的输出。如果您有更多数据，您可能 运行 进入 100 级递归限制，但您可以对其进行配置。或者找到更好的解决方案 :) 但从技术上讲，这是可行的：
;with cte_trans_relationships (frommembershipid, tomembershipid)
as
(
select frommembershipid, tomembershipid
from @transfer
union all
select c.frommembershipid, t.tomembershipid
from cte_trans_relationships c
inner join @transfer t on c.tomembershipid = t.frommembershipid
),
cte_trans_relationships2 (tomembershipid, frommembershipid)
as
(
select tomembershipid, frommembershipid
from @transfer
union all
select c.tomembershipid, t.frommembershipid
from cte_trans_relationships c
inner join @transfer t on c.frommembershipid = t.tomembershipid
),
cte_trans_all (m1, m2)
as
(
select distinct frommembershipid m1, tomembershipid m2
from cte_trans_relationships c
union
select distinct tomembershipid, frommembershipid
from cte_trans_relationships2 c2
)
select m.personid, m.membershipid, m.membershipdate, m.cservicedate,
case when sq.cservicedate < cservicedate1 and sq.cservicedate < cservicedate2 then sq.cservicedate
when cservicedate1 < sq.cservicedate and cservicedate1 < cservicedate2 then cservicedate1
else cservicedate2 end as ECSD
from @memberships m
inner join
(
select m.personid, m.membershipid, isnull(m.cservicedate, dateadd(year, 100, getdate())) as cservicedate,
isnull(min(m1.cservicedate), dateadd(year, 100, getdate())) as cservicedate1,
isnull(min(m2.cservicedate), dateadd(year, 100, getdate())) as cservicedate2
from @memberships m
left join cte_trans_all sq_trans1 on m.membershipid = sq_trans1.m1
left join @memberships m1 on sq_trans1.m2 = m1.membershipid and m1.membershipdate < m.membershipdate
left join cte_trans_all sq_trans2 on m.membershipid = sq_trans2.m1
left join @memberships m2 on sq_trans2.m2 = m2.membershipid and m2.membershipdate < m.membershipdate
group by m.personid, m.membershipid, m.cservicedate
)sq on m.personid = sq.personid and m.membershipid = sq.membershipid
以下是用于测试的示例 DDL/DML 语句：
declare @memberships table (personid int, membershipid int, membershipdate datetime, cservicedate datetime)
insert into @memberships values (1, 15, '8/1/2016', '8/27/2017')
insert into @memberships values (1, 16, '3/25/2016', '9/1/2000')
insert into @memberships values (1, 17, '12/6/2011', '5/15/1995')
insert into @memberships values (1, 18, '1/12/2009', '2/28/1998')
insert into @memberships values (1, 19, '4/8/2016', '7/10/1994')
insert into @memberships values (1, 20, '6/11/2010', '11/12/1997')
--insert into @memberships values (499510, 548426, '9/29/2014', '9/29/2014')
--insert into @memberships values (499510, 548428, '1/29/2014', '1/29/2014')
--insert into @memberships values (499510, 548425, '5/28/2012', '5/28/2012')
--insert into @memberships values (499510, 548429, '11/23/2011', '11/23/2011')
--insert into @memberships values (499510, 548427, '7/3/2008', '7/3/2008')
--insert into @memberships values (499510, 548431, '5/1/2001', '1/1/1976')
--insert into @memberships values (499510, 548430, '10/8/1998', '10/8/1998')
declare @transfer table (tid int, pid int, frommembershipid int, tomembershipid int)
insert into @transfer values (1, 1, 16, 15)
insert into @transfer values (2, 1, 18, 17)
insert into @transfer values (3, 1, 19, 17)
insert into @transfer values (4, 1, 20, 18)
insert into @transfer values (5, 1, 20, 19)
--insert into @transfer values (10664, 499510, 548430, 548431)
--insert into @transfer values (10665, 499510, 548431, 548427)
--insert into @transfer values (10666, 499510, 548427, 548429)
--insert into @transfer values (10667, 499510, 548429, 548425)
--insert into @transfer values (10668, 499510, 548425, 548428)
--insert into @transfer values (10669, 499510, 548428, 548426)
--insert into @transfer values (13085, 499510, 548430, 548427)
--insert into @transfer values (13086, 499510, 548427, 548425)
--insert into @transfer values (13087, 499510, 548425, 548426)
--insert into @transfer values (13088, 499510, 548431, 548429)
--insert into @transfer values (13089, 499510, 548429, 548428)
这是 2 个结果集：
personid membershipid membershipdate cservicedate ECSD
1 15 2016-08-01 2017-08-27 2000-09-01
1 16 2016-03-25 2000-09-01 2000-09-01
1 17 2011-12-06 1995-05-15 1995-05-15
1 18 2009-01-12 1998-02-28 1998-02-28
1 19 2016-04-08 1994-07-10 1994-07-10
1 20 2010-06-11 1997-11-12 1997-11-12
personid membershipid membershipdate cservicedate ECSD
499510 548425 2012-05-28 2012-05-28 1976-01-01
499510 548426 2014-09-29 2014-09-29 1976-01-01
499510 548427 2008-07-03 2008-07-03 1976-01-01
499510 548428 2014-01-29 2014-01-29 1976-01-01
499510 548429 2011-11-23 2011-11-23 1976-01-01
499510 548430 1998-10-08 1998-10-08 1998-10-08
499510 548431 2001-05-01 1976-01-01 1976-01-01