Question

我是SQL Server的新手，所以对此有任何帮助将不胜感激。使用自动生成的记录

更新现有列时，我找不到错误

这是我的表结构： -

CREATE TABLE [dbo].[EmployeeRegistration]
(
    [ID] [int] NULL,
    [Sr_no] [int] IDENTITY(1,1) NOT NULL,
    [Branch_Code] [varchar](200) NULL,
    [City] [varchar](200) NULL,
    [Employee_Name] [varchar](200) NULL,
    [Designation] [varchar](200) NULL,
    [Department] [varchar](200) NULL,
    [Date_of_Joining] [varchar](200) NULL,
    [Reporting_To] [varchar](200) NULL,
    [Staff_Code] [varchar](50) NULL,
    [Reporting_To_1] [varchar](200) NULL,
    [Staff_Code_1] [varchar](50) NULL,
    [Emp_Staff_Code]  AS ('T'+right('0000'+CONVERT([varchar](8),[Sr_no],(0)),(8))),
    [Password] [varchar](50) NULL,
    [confirmPassword] [varchar](50) NULL,
    [EMAIL_id] [varchar](50) NULL,
    [IsActive] [varchar](200) NULL,
    [Created_By] [varchar](200) NULL,
    [Created_On] [date] NOT NULL,
    [Modified_By] [varchar](200) NULL,
    [Modified_Date] [date] NOT NULL
)

我想使用以下查询更新Password列： -

use AxpressDB 

alter table EmployeeRegistration 
   alter column Password AS ('XP'+right('0123'+CONVERT([varchar](50),[Sr_no],(0)),(8)))

Answer 1

列更改的语法：

 ALTER TABLE tablename
    ALTER COLUMN columnname columndatatype(size)

和示例：

 ALTER TABLE dbo.doc_exy 
    ALTER COLUMN column_a DECIMAL (5, 2) ;

尝试这些方式

Answer 2

您无法更改现有列并将其设为计算列，您需要删除并重新创建

alter table EmployeeRegistration 
   drop column Password 
alter table EmployeeRegistration 
   add Password AS ('XP'+right('0123'+CONVERT([varchar](50),[Sr_no],(0)),(8)))

如何更新SQL Server 2008中的列

2 个答案: