3
我不知道是否存在于TSQL(CTE)递归更新TSQL递归更新?
ID parentID value
-- -------- -----
1 NULL 0
2 1 0
3 2 0
4 3 0
5 4 0
6 5 0
我能够更新列value
递归使用e.g CTE从ID = 6至最顶部行?
我不知道是否存在于TSQL(CTE)递归更新TSQL递归更新?
ID parentID value
-- -------- -----
1 NULL 0
2 1 0
3 2 0
4 3 0
5 4 0
6 5 0
我能够更新列value
递归使用e.g CTE从ID = 6至最顶部行?
是的,应该是。 MSDN gives an example:
USE AdventureWorks;
GO
WITH DirectReports(EmployeeID, NewVacationHours, EmployeeLevel)
AS
(SELECT e.EmployeeID, e.VacationHours, 1
FROM HumanResources.Employee AS e
WHERE e.ManagerID = 12
UNION ALL
SELECT e.EmployeeID, e.VacationHours, EmployeeLevel + 1
FROM HumanResources.Employee as e
JOIN DirectReports AS d ON e.ManagerID = d.EmployeeID
)
UPDATE HumanResources.Employee
SET VacationHours = VacationHours * 1.25
FROM HumanResources.Employee AS e
JOIN DirectReports AS d ON e.EmployeeID = d.EmployeeID;
您想更新什么?是一个程序循环好吗?或者是单个更新声明中的全部要求? – Randy 2010-12-01 13:19:53
我犯了一个错误,再读一遍最后一句 – Tony 2010-12-01 13:22:25