如何从 SQL Server 中选择 y 行后的数据 top x 数据

Question

例如，我有一个包含 10'000 行的表。我想在前 500 行之后选择前 100 行。我怎样才能最有效地做到这一点。

SQL Server 2008 需要查询

---

例如我已经有这个查询，但我想知道有没有更有效的解决方案

SELECT TOP 100 xx
FROM nn 
WHERE cc NOT IN 
   (SELECT TOP 500 cc
      FROM nn ORDER BY cc ASC)

Answer 1

选择 TOP 500，然后将 TOP 100 连接到结果集。

通常，为了值得这样做，您需要有一些标准来确定您需要 500 条记录的条件，而其他条件只需要 100 条记录。我假设这些条件是 TOP 500 的 condition1，以及您想要的 TOP 100 的 condition2。由于条件不同，这就是为什么根据 TOP 100 的记录可能不一样的原因。

select TOP 500 *
    from MyTable
    where -- condition1 -- Retrieving the first 500 rows meeting condition1
union
    select TOP 100 *
        from MyTable
        where -- condition2 -- Retrieving the first 100 rows meeting condition2
-- The complete result set of the two queries will be combined (UNIONed) into only one result set.

编辑#1

这不是我的意思。我想选择前 500 行之后的前 100 行。所以选择行 501-600

在您发表评论后，我更好地理解了您想要实现的目标。试试这个：

WITH Results AS (
    select TOP 600 f.*, ROW_NUMBER() OVER (ORDER BY f.[type]) as RowNumber
        from MyTable f
) select *
    from Results
    where RowNumber between 501 and 600

这有帮助吗？

Answer 2

SELECT 
  col1,
  col2
FROM (
    SELECT ROW_NUMBER() OVER (
        ORDER BY [t0].someColumn) as ROW_NUMBER,
    col1,
    col2
    FROM [dbo].[someTable] AS [t0]
    ) AS [t1]
WHERE [t1].[ROW_NUMBER] BETWEEN 501 and 600
ORDER BY [t1].[ROW_NUMBER]

Answer 3

Select T0P 600 * 
from my table
where --whatever condition you want
except
select top 500 * 
from mytable
where --whatever condition you want

Answer 4

Tutorial 25: Efficiently Paging Through Large Amounts of Data

with cte as (
 SELECT ...,
  ROW_NUMBER () OVER (ORDER BY ...) as rn
 FROM ...)
SELECT ... FROM cte 
WHERE rn BETWEEN 500 and 600;