从另一个表更新表格与信息的列

Question

林已经有这样的：。

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] 

如何提高查询到的值复制从[newtable的]到[DBO] [PersonPhone] [起始日期]排？

Answer 1

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]