获取用于分页的指定范围内的行

Question

我正在尝试写一个查询来实现分页，我的基本要求是我需要一个查询，在这个查询中，我可以给出返回的最小和最大行数范围，例如，对于页面1，我需要从1- 10到11-20的记录，以此类推。

通过一些帮助，形成互联网，在这里，我已经写下了以下查询，但它并不是真的工作，它应该返回给我一个大的总行，无论范围是什么(可能我在查询中遗漏了一些连接)

SELECT b.id,b.title,b.name
FROM (
    SELECT ROW_NUMBER() OVER(ORDER BY (select NULL as noorder)) AS RowNum, * 
    FROM [student] b
) as alias,[student] b,[class] c
WHERE b.[status]=1 
AND c.id=b.class 
AND c.name='Science' 
AND RowNum BETWEEN 1 AND 5
ORDER BY b.dtetme DESC

我在修理的时候迷路了，有人能指出一下错误吗？谢谢!

Answer 1

你的整个查询逻辑+ ROW_NUMBER应该放在子查询中。您只使用外部WHERE进行分页。

ROW_NUMBER必须具有要在其上实现分页的ORDER BY。

SELECT  a.id ,
        a.title ,
        a.name
FROM    
   ( 
        SELECT ROW_NUMBER() OVER (ORDER BY b.dtetme DESC) AS RowNum, b.*
        FROM  [student] b 
        INNER JOIN [class] c ON  c.id = b.class
        WHERE b.[status] = 1
        AND c.name = 'Science'
    ) a
WHERE RowNum BETWEEN 1 AND 10 -- change numbers here for pages
ORDER BY t.RowNum

Answer 2

我认为问题出在FROM中添加了[student] b，请尝试将连接移动到子查询中。

SELECT a.id, a.title, a.name
FROM (
    SELECT ROW_NUMBER() OVER(ORDER BY (select NULL as noorder)) AS RowNum, * 
    FROM [student] b
    JOIN [class] c ON c.id = b.class
    WHERE b.[status]=1 
    AND c.name='Science' 
) as a
WHERE a.RowNum BETWEEN 1 AND 5
ORDER BY a.dtetme DESC

此外，您可能希望考虑将其包装在过程或函数中，以便可以更改范围。

Answer 3

看起来你想要这样的东西：

SELECT t.id,t.title,t.name FROM (
    SELECT s.id,s.title,s.name, RowNum = ROW_NUMBER() OVER(ORDER BY s.dtetme DESC)
    FROM student s
    INNER JOIN class c ON c.id = s.class
    WHERE s.[status]=1 AND c.name='Science' ) AS t
WHERE t.RowNum BETWEEN 1 AND 5
ORDER BY t.RowNum