Sql CTE递归选择并插入到具有新id和一些更新字段的同一个表中
假设我有这张桌子:Sql CTE递归选择并插入到具有新id和一些更新字段的同一个表中,sql,sql-server,recursion,common-table-expression,hierarchy,Sql,Sql Server,Recursion,Common Table Expression,Hierarchy,假设我有这张桌子: |TeamId |Name |ActiveYear |ParentTeamId |OriginTeamId | +-------+---------------+-----------+-------------+-------------+ |1 |Founding Team |2020 |NULL |NULL | |2 |Elders Team |2020 |1
|TeamId |Name |ActiveYear |ParentTeamId |OriginTeamId |
+-------+---------------+-----------+-------------+-------------+
|1 |Founding Team |2020 |NULL |NULL |
|2 |Elders Team |2020 |1 |NULL |
|3 |Younger Team |2020 |1 |NULL |
|4 |Women Team |2020 |2 |NULL |
|5 |Men´s Team |2020 |2 |NULL |
当我查询它时,我可以看到层次结构:
WITH abcd AS
(
-- anchor
SELECT
CAST((Convert(varchar(20), TeamId)) AS VARCHAR(1000)) AS "Tree",
TeamId, [Name], Activeyear, ParentTeamId, OriginTeamId
FROM
Teams AS p
WHERE
ParentTeamId IS NULL And ActiveYear = 2020
UNION ALL
--recursive member
SELECT
CAST((CONVERT(varchar(20), a.tree) + '/' + CONVERT(varchar(20), c.TeamId)) AS VARCHAR(1000)) AS "Tree",
c.TeamId, c.[Name], c.Activeyear, c.ParentTeamId, c.OriginTeamId
FROM
Teams AS c
JOIN
abcd AS a ON c.ParentTeamId = a.TeamId
WHERE
c.ActiveYear = 2020
)
SELECT *
FROM abcd
现在,我需要更新这个表,重新创建相同的结构,但使用新id和Activeyear=2021
因此,新的父记录仍然是其他新记录的父记录
我想做一个查询,它允许我克隆这个数据并插入一些更新:ActiveYear=2021,OriginTeamIDorigInteramid是为了确定这些信息的来源
我该怎么做呢?一种方法是分两步进行。插入没有ID的行。然后计算出ID:
insert into teams (name, activeyear, parentid)
select name, 2021, parentid
from teams
where actdiveyear = 2020;
现在通过查找相应的ID来更新这些值。窗口功能在这里有帮助:
insert into teams (name, activeyear, ParentTeamId)
select name, 2021, ParentTeamId
from teams
where activeyear = 2020;
with corresponding as (
select t2020.teamid as teamid_2020, t2021.teamid as teamid_2021
from teams t2020 join
teams t2021
on t2020.name = t2021.name
where t2020.activeyear = 2020 and t2021.activeyear = 2021
)
update t
set ParentTeamId = c.teamid_2021
from teams t join
corresponding c
on t.ParentTeamId = c.teamid_2020
where t.activeyear = 2021;
是一个dbfiddle。一种方法是分两步进行。插入没有ID的行。然后计算出ID:
insert into teams (name, activeyear, parentid)
select name, 2021, parentid
from teams
where actdiveyear = 2020;
现在通过查找相应的ID来更新这些值。窗口功能在这里有帮助:
insert into teams (name, activeyear, ParentTeamId)
select name, 2021, ParentTeamId
from teams
where activeyear = 2020;
with corresponding as (
select t2020.teamid as teamid_2020, t2021.teamid as teamid_2021
from teams t2020 join
teams t2021
on t2020.name = t2021.name
where t2020.activeyear = 2020 and t2021.activeyear = 2021
)
update t
set ParentTeamId = c.teamid_2021
from teams t join
corresponding c
on t.ParentTeamId = c.teamid_2020
where t.activeyear = 2021;
是一把小提琴。是的!为了更容易地更新ID,我在insert中包含了OriginTeamId,在Select中包含了TeamId。然后在更新中我使用:on t2020.TeamId=t2021.OriginTeamId.Yes!为了更容易地更新ID,我在insert中包含了OriginTeamId,在Select中包含了TeamId。然后在更新中我使用:on t2020.TeamId=t2021.OriginTeamId。