Question

我错过了什么？我正在尝试使用新列更改表并插入其中。最后，我想插入一个变量@loopcounter。但它似乎没有认识到新专栏。

这是表格

SELECT 
    [dbo].[webpages_UsersInRoles].[UserId],
    [dbo].[UserProfile].[UserName],
    [dbo].[UserProfile].[CustomerId],
    [dbo].[webpages_UsersInRoles].[RoleId],
    [dbo].[webpages_Roles].[RoleName]
INTO
    #ControlTable
FROM 
    [dbo].[webpages_UsersInRoles]
INNER JOIN
    [dbo].[UserProfile] ON [dbo].[webpages_UsersInRoles].[UserId] = [dbo].[UserProfile].UserId
INNER JOIN 
    [dbo].[webpages_Roles] ON [webpages_UsersInRoles].[RoleId]=[dbo].[webpages_Roles].[RoleId]
WHERE
    CustomerId = 'DEMO'

改变/插入：

ALTER TABLE #ControlTable
   ADD Loopfield INT;

INSERT INTO #ControlTable (Loopfield)
VALUES (1)

SELECT * FROM #ControlTable;

Answer 1

我想你想要：

alter table #ControlTable add LoopField int identity(1, 1);

或者只是使用标识列创建表：

SELECT identity(1, 1) as loopfield,
       [dbo].[webpages_UsersInRoles].[UserId],
       [dbo].[UserProfile].[UserName],
       [dbo].[UserProfile].[CustomerId],
       [dbo].[webpages_UsersInRoles].[RoleId],
       [dbo].[webpages_Roles].[RoleName]

或者，如果您不打算在表格中插入新行，row_number()就足够了：

SELECT row_number() over (order by (select null)) as loopfield,
       [dbo].[webpages_UsersInRoles].[UserId],
       [dbo].[UserProfile].[UserName],
       [dbo].[UserProfile].[CustomerId],
       [dbo].[webpages_UsersInRoles].[RoleId],
       [dbo].[webpages_Roles].[RoleName]

Answer 2

对我来说效果很好。

create table #temp (name varchar(10));
insert into #temp values ('bob'), ('mary');
ALTER TABLE #temp
   ADD Loopfield INT;
declare @Loopfield int = 1;
INSERT INTO #temp (Loopfield)
VALUES (@Loopfield);
select * from #temp;
drop table #temp;

SQL Server：插入新列不起作用

2 个答案: