假设我有下表:
CustomerID ParentID Name
========== ======== ====
1 null John
2 1 James
3 2 Jenna
4 3 Jennifer
5 3 Peter
6 5 Alice
7 5 Steve
8 1 Larry
我想在一个查询中检索詹姆斯的所有后代(詹娜,詹妮弗,彼得,爱丽丝,史蒂夫)。
谢谢,
巴勃罗。
最佳答案
在SQL Server 2005上,您可以使用CTEs (Common Table Expressions):
with Hierachy(CustomerID, ParentID, Name, Level)
as
(
select CustomerID, ParentID, Name, 0 as Level
from Customers c
where c.CustomerID = 2 -- insert parameter here
union all
select c.CustomerID, c.ParentID, c.Name, ch.Level + 1
from Customers c
inner join Hierachy ch
on c.ParentId = ch.CustomerID
)
select CustomerID, ParentID, Name
from Hierachy
where Level > 0
关于sql - 如何在MSSQL 2005中创建递归查询?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/239275/