将 LIMIT 和 OFFSET 应用于 MS SQL Server 2008 查询

Question

我需要将LIMIT 和OFFSET 应用于MSSQL server 2008 中的原始查询（无需修改）。

假设原始查询是：

SELECT * FROM energy_usage

（但它可以是任意的 SELECT 查询）

到目前为止，我就是这么想的：

1. 它可以满足我的需要，但查询会生成我不需要的 extra 列 row_number。

WITH OrderedTable AS
(
 SELECT ROW_NUMBER() OVER (ORDER BY (SELECT 1)) AS row_number,  * FROM energy_usage
)   
SELECT * FROM OrderedTable WHERE row_number BETWEEN 1 AND 10

2.这个由于某种原因不起作用并返回以下错误。

SELECT real_sql.* FROM (
SELECT ROW_NUMBER() OVER (ORDER BY (SELECT 1)) AS row_number, * FROM (SELECT * FROM energy_usage) as real_sql) as subquery
WHERE row_number BETWEEN 1 AND 10

比较常见的情况是：

SELECT real_sql.* FROM (
SELECT ROW_NUMBER() OVER (ORDER BY (SELECT 1)) AS row_number,  * FROM (real sql query) as real_sql) as subquery
WHERE row_number BETWEEN {offset} + 1 AND {limit} + {offset}

错误：

列前缀“real_sql”与表名或别名不匹配 查询中使用的名称。

Answer 1

干脆不要放在SELECT名单上：

WITH OrderedTable AS
(
 SELECT ROW_NUMBER() OVER (ORDER BY (SELECT 1)) AS row_number,  * 
 FROM energy_usage
)   
SELECT col1, col2, col3 FROM OrderedTable WHERE row_number BETWEEN 1 AND 10;

SELECT * 是常见的反模式，无论如何都应该避免。另外ORDER BY (SELECT 1) 不会保证执行之间的排序稳定。

如果您只需要十行，则使用第二个：

 SELECT TOP 10 *
 FROM energy_usage
 ORDER BY ...

---

很遗憾，你不会得到像Selecting all Columns Except One 这样好的东西

WITH OrderedTable AS
    (
     SELECT ROW_NUMBER() OVER (ORDER BY (SELECT 1)) AS row_number,  * 
     FROM energy_usage
    )   
SELECT * EXCEPT row_number FROM OrderedTable WHERE row_number BETWEEN 1 AND 10;

Answer 2

这样可以解决问题。

DECLARE @offset INT = 1;
DECLARE @limit INT = 10;

WITH Filtered AS (
    SELECT TOP (@offset + @limit) *
    FROM energy_usage
    ORDER BY 1 ASC
), Results AS (
    SELECT TOP (@limit) *
    FROM Filtered
    ORDER BY 1 DESC
)
SELECT *
FROM Results
ORDER BY 1 ASC;