Question

我有以下存储过程，我正在处理。我注意到，每刷新一次我的第5或第6次结果，就会有新值。考虑到数据处于静态环境中并且此时没有人对数据进行任何更改，我实在无法理解。有人可以告诉我为什么我会看到不同的结果，即使我使用完全相同的参数运行此过程。我甚至在查询分析器中尝试过，仍然看到同样奇怪的结果。

我在Sql 2008中运行。

这是proc：

ALTER PROCEDURE [dbo].[SelectSearchBy_Category]
    @userId     INT,
    @page       INT,
    @results        INT,
    @category       NVARCHAR(50),
    @searchTerm NVARCHAR(200) = NULL
AS
BEGIN

    SET NOCOUNT ON
    SET ROWCOUNT @results

    DECLARE @categoryId INT

    IF (@category IS NOT NULL) BEGIN
        SET @categoryId = ( SELECT categoryId FROM Category WHERE categoryDescription = @category )
    END

    DECLARE @rowEnd     INT
    DECLARE @rowStart   INT
    SET @rowEnd = (@page * @results)
    SET @rowStart = @rowEnd - @results

    ;WITH OrderedItems AS 
    (   
        SELECT
            i.itemId,
            title,
            i.[description],
            i.url,
            i.categoryId,
            i.ratingId,
            i.requirements,
            ISNULL(i.rating, 0) AS tating,
            ISNULL(i.raters, 0) AS raters,
            i.urlFriendlyPath,
            ROW_NUMBER() OVER
            (
                ORDER BY i.dateAdded, (ISNULL(i.rating, 0) * ISNULL(i.raters, 0))
            ) AS RowNumber
        FROM
            [dbo].[Item] i
        LEFT JOIN
            UserItemIgnore uii ON uii.itemId = i.itemId AND uii.userId = @userId
        INNER JOIN
            ItemLanguage il ON il.itemId = i.itemId
        WHERE
            (@searchTerm IS NULL OR a.title LIKE '%' + @searchTerm + '%') AND
            i.categoryId = @categoryId AND
            il.languageId = 1 AND
            uii.itemId IS NULL
    )

    SELECT *
    FROM OrderedItems
    WHERE RowNumber BETWEEN @rowStart AND @rowEnd

END

Answer 1

如果在order by临时表定义中放置OrderedItems子句，则可能会得到一致的结果。

Answer 2

尝试使用

 ROW_NUMBER() OVER (ORDER BY i.dateAdded, 
                             (ISNULL(i.rating, 0) * ISNULL(i.raters, 0)), 
                             i.itemId)

i.itemId将起到打破平局的作用，以确保ROW_NUMBER具有相同排名的行，i.dateAdded, (ISNULL(i.rating, 0) * ISNULL(i.raters, 0))的结果是确定性的

为什么我的结果不能保持一致？

2 个答案: