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[英]Oracle Trigger update column with information from another column in the same table
[英]Update a column in table with information from another table
我已经有了这个:
USE [AdventureWorks2012];
--- somewhere create table
IF OBJECT_ID('[dbo].[PersonPhone]','U') IS NOT NULL
DROP TABLE [dbo].[PersonPhone]
CREATE TABLE [dbo].[PersonPhone](
[BusinessEntityID] [int] NOT NULL,
[PhoneNumber] nvarchar(25) NOT NULL,
[PhoneNumberTypeID] [int] NOT NULL,
[ModifiedDate] [datetime] NOT NULL)
--- and append new column
ALTER Table [dbo].[PersonPhone]
ADD [StartDate] date NULL
--- after this, i want copy dates in this column (at another table, we increase dates by one)
UPDATE [dbo].[PersonPhone]
SET [StartDate] = [NewTable].[NewDate]
FROM (
SELECT DATEADD(day, 1, [HumanResources].[EmployeeDepartmentHistory].[StartDate]) AS [NewDate],
row_number() over(order by (select 1)) AS [RN]
FROM [HumanResources].[EmployeeDepartmentHistory]
) [NewTable]
如何改进查询以将值从[NewTable]复制到[dbo]。[PersonPhone]。[StartDate]行?
在您的更新:
UPDATE [dbo].[PersonPhone]
SET [StartDate] = DATEADD(day, 1, [HumanResources].[EmployeeDepartmentHistory].[StartDate])
FROM [HumanResources].[EmployeeDepartmentHistory]
GO
SELECT row_number() over(order by (select 1)) AS [RN] FROM [HumanResources].[EmployeeDepartmentHistory]
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