SQL Server:TOP子句有替代品吗? [重复]

[英]SQL Server : is there any alternate for TOP clause? [duplicate]


Possible Duplicate:
Equivalent of LIMIT and OFFSET for SQL Server?

可能重复:SQL Server的LIMIT和OFFSET的等价物?

I am working on a table which currently contains 2500 rows, and will be much more and more in future.

我正在研究一个目前包含2500行的表,将来会越来越多。

I am using jqgrid to display the records from the database .

我正在使用jqgrid来显示数据库中的记录。

Whenever the grid is loading, I am retrieving the top 500 rows from the database. However when I am started using pagination in the grid, the number of records is adding.

每当网格加载时,我都会从数据库中检索前500行。但是当我开始在网格中使用分页时,记录的数量正在增加。

Example : first the number of rows is TOP 100, then going onto the next page its increased to TOP 200 and so on in the query.

示例:首先行数为TOP 100,然后进入下一页,其增加到TOP 200,依此类推。

Now I want a solution to avoid this issue such that I can limit the rows instead of retrieving top n rows based on the grid. Say using a range or LIMIT

现在我想要一个解决方案来避免这个问题,这样我就可以限制行而不是根据网格检索前n行。假设使用范围或LIMIT

Example

When I am navigating to next page in grid, instead of TOP 200 rows I want to fetch rows from 101 to 200

当我在网格中导航到下一页时,我想要从101到200获取行,而不是前200行

 select top 500
        exe.id,
        bat.BName,
        bat.tid,
        bat.freq,
        exe.status,
        exe.Msg,
        exe.time,
        exe.Fi
    from
       XXX exe,
        YYY bat 
    where
        exe.id=bat.id   
    order by     
        CONVERT(VARCHAR(10),
        exe.time,
        120) DESC,
        exe.status,
        exe.id DESC

Please guide me in this, as I am new to jQGrid and not much aware how to handle this DB related stuff

请指导我,因为我是jQGrid的新手并且不太了解如何处理这个与DB相关的东西

I also referred few links in Stackoverflow but can't understand

我还在Stackoverflow中引用了一些链接但无法理解

Thanks in advance

提前致谢

1 个解决方案

#1


5  

You can use ROW_NUMBER(), the row_number() is not assigned until you query the data so if you want to retrieve the data by the row_number() value, then you will need to use CTE or a sub-select to get the value for use in a WHERE clause.

你可以使用ROW_NUMBER(),在查询数据之前不会分配row_number(),所以如果你想通过row_number()值检索数据,那么你需要使用CTE或子选择来获取值用于WHERE子句。

SELECT *
FROM
(
  select  exe.id,
        bat.BName,
        bat.tid,
        bat.freq,
        exe.status,
        exe.Msg,
        exe.time,
        exe.Fi,
        row_number() over(order by CONVERT(VARCHAR(10), exe.time, 120) DESC,
                   exe.status, exe.id DESC) rn
  from XXX exe,
       YYY bat 
  where exe.id=bat.id  
) x
WHERE rn between 101 and 200

I would also suggest a change in your JOIN syntax to use ANSI syntax:

我还建议您更改JOIN语法以使用ANSI语法:

SELECT *
FROM
(
  select  exe.id,
        bat.BName,
        bat.tid,
        bat.freq,
        exe.status,
        exe.Msg,
        exe.time,
        exe.File,
        row_number() over(order by CONVERT(VARCHAR(10), exe.time, 120) DESC,
                   exe.status, exe.id DESC) rn
  from XXXexe
  INNER JOIN  YYY bat 
     ON exe.id=bat.id  
) x
WHERE rn between 101 and 200

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