下面是我的解决方案，它使用了一个无限循环、BREAK语句和@@ROWCOUNT函数。没有游标或临时表是必要的，我只需要写一个查询，以获得下一行在@databases表:

declare @databases table
(
    DatabaseID    int,
    [Name]        varchar(15),   
    [Server]      varchar(15)
);


-- Populate the [@databases] table with test data.
insert into @databases (DatabaseID, [Name], [Server])
select X.DatabaseID, X.[Name], X.[Server]
from (values 
    (1, 'Roger', 'ServerA'),
    (5, 'Suzy', 'ServerB'),
    (8675309, 'Jenny', 'TommyTutone')
) X (DatabaseID, [Name], [Server])


-- Create an infinite loop & ensure that a break condition is reached in the loop code.
declare @databaseId int;

while (1=1)
begin
    -- Get the next database ID.
    select top(1) @databaseId = DatabaseId 
    from @databases 
    where DatabaseId > isnull(@databaseId, 0);

    -- If no rows were found by the preceding SQL query, you're done; exit the WHILE loop.
    if (@@ROWCOUNT = 0) break;

    -- Otherwise, do whatever you need to do with the current [@databases] table row here.
    print 'Processing @databaseId #' + cast(@databaseId as varchar(50));
end

以下是我的做法:

Select Identity(int, 1,1) AS PK, DatabaseID
Into   #T
From   @databases

Declare @maxPK int;Select @maxPK = MAX(PK) From #T
Declare @pk int;Set @pk = 1

While @pk <= @maxPK
Begin

    -- Get one record
    Select DatabaseID, Name, Server
    From @databases
    Where DatabaseID = (Select DatabaseID From #T Where PK = @pk)

    --Do some processing here
    -- 

    Select @pk = @pk + 1
End

[编辑]因为我可能在第一次读这个问题时跳过了“变量”这个词，这里是一个更新的回答…

declare @databases table
(
    PK            int IDENTITY(1,1), 
    DatabaseID    int,
    Name        varchar(15),   
    Server      varchar(15)
)
-- insert a bunch rows into @databases
--/*
INSERT INTO @databases (DatabaseID, Name, Server) SELECT 1,'MainDB', 'MyServer'
INSERT INTO @databases (DatabaseID, Name, Server) SELECT 1,'MyDB',   'MyServer2'
--*/

Declare @maxPK int;Select @maxPK = MAX(PK) From @databases
Declare @pk int;Set @pk = 1

While @pk <= @maxPK
Begin

    /* Get one record (you can read the values into some variables) */
    Select DatabaseID, Name, Server
    From @databases
    Where PK = @pk

    /* Do some processing here */
    /* ... */ 

    Select @pk = @pk + 1
End

Step1:下面的select语句为每条记录创建一个具有唯一行号的临时表。

select eno,ename,eaddress,mobno int,row_number() over(order by eno desc) as rno into #tmp_sri from emp 

步骤2:声明所需的变量

DECLARE @ROWNUMBER INT
DECLARE @ename varchar(100)

步骤3:从临时表中获取总行数

SELECT @ROWNUMBER = COUNT(*) FROM #tmp_sri
declare @rno int

Step4:根据在temp中创建的唯一行号循环temp表

while @rownumber>0
begin
  set @rno=@rownumber
  select @ename=ename from #tmp_sri where rno=@rno  **// You can take columns data from here as many as you want**
  set @rownumber=@rownumber-1
  print @ename **// instead of printing, you can write insert, update, delete statements**
end

我同意之前的帖子，基于集的操作通常会执行得更好，但如果你确实需要遍历行，下面是我将采取的方法:

Add a new field to your table variable (Data Type Bit, default 0) Insert your data Select the Top 1 Row where fUsed = 0 (Note: fUsed is the name of the field in step 1) Perform whatever processing you need to do Update the record in your table variable by setting fUsed = 1 for the record Select the next unused record from the table and repeat the process DECLARE @databases TABLE ( DatabaseID int, Name varchar(15), Server varchar(15), fUsed BIT DEFAULT 0 ) -- insert a bunch rows into @databases DECLARE @DBID INT SELECT TOP 1 @DBID = DatabaseID from @databases where fUsed = 0 WHILE @@ROWCOUNT <> 0 and @DBID IS NOT NULL BEGIN -- Perform your processing here --Update the record to "used" UPDATE @databases SET fUsed = 1 WHERE DatabaseID = @DBID --Get the next record SELECT TOP 1 @DBID = DatabaseID from @databases where fUsed = 0 END

这种方法只需要一个变量，并且不会从@databases中删除任何行。我知道这里有很多答案，但我没有看到像这样使用MIN来获取下一个ID的答案。

DECLARE @databases TABLE
(
    DatabaseID    int,
    Name        varchar(15),   
    Server      varchar(15)
)

-- insert a bunch rows into @databases

DECLARE @CurrID INT

SELECT @CurrID = MIN(DatabaseID)
FROM @databases

WHILE @CurrID IS NOT NULL
BEGIN

    -- Do stuff for @CurrID

    SELECT @CurrID = MIN(DatabaseID)
    FROM @databases
    WHERE DatabaseID > @CurrID

END

你可以使用while循环:

While (Select Count(*) From #TempTable) > 0
Begin
    Insert Into @Databases...

    Delete From #TempTable Where x = x
End