Question

我正在尝试编写一个查询来实现分页，我的基本要求是我需要一个查询，我可以给出最小和最大行范围，例如：对于第1页，我需要从1到10的页面到11-20的记录，依此类推。

通过互联网的一些帮助，在这里，我已经写下了以下的查询，但它并没有真正按照它应该的方式运行，并且无论范围是什么，我都会返回一大笔行（可能我错过了一些加入查询）

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

我在修理它时迷路了，有人可以指出错误。谢谢！

Answer 1

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

ROW_NUMBER必须有ORDER BY来实现分页。

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

我认为问题是在[student] b中添加了FROM，尝试将联接移动到子查询中。

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，您可能需要考虑将其包装在过程或函数中，以便更改范围。

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

获取指定范围内的行以进行分页

3 个答案: