sql-server - 为什么我的结果不一致？

Question

我正在处理以下存储过程。我注意到，每五次或六次刷新结果时，都会有新值。考虑到数据处于静态环境并且此时没有人对数据进行任何更改，我真的无法理解。有人可以告诉我为什么即使我使用完全相同的参数运行此过程也会看到不同的结果。我什至在查询分析器中尝试过它，但仍然看到同样奇怪的结果。

我正在 Sql 2008 中运行。

这是过程:

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

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