如何在具有WHERE子句的SQL中查找最大列值？

Question

我正在尝试用SQL编写过程。我想在将所有日期条目匹配到传递的输入参数之后，从表中打印带有“最大分数”的记录。现在，该代码仅打印与指定日期相对应的所有记录。在这种情况下，我不确定如何使用MAX（）。

/* =========================================================
Procedure to find the Highest Movie Rating on a particular date.
Given, an inpDate (input Date) it first looks up all Movie Reviews
of that particular date.
Then, it checks a StandardizedReviews Table (sTbl) and
finds the MAXIMUM adjusted_score with the
Highest Review Score (the variable adjusted_score)
========================================================= */
Use StandardizedReviews
Drop Procedure if exists HighestReview;
GO

CREATE PROCEDURE HighestReview @inpDate DATE AS (
        SELECT sTbl.adjusted_score "Max Score"
        FROM dbo.StandardizedReviews sTbl
        WHERE CAST(sTbl.date as DATE) = CAST(@inpDate as DATE)
        GROUP BY sTbl.date, sTbl.adjusted_score
)
GO
exec HighestReview '2020-03-05'
GO

现在，我的输出看起来像：

但是我希望它只显示分数为100的记录。谢谢。

Answer 1

您只需要用MAX（）AS'Max Score'来包装Adjusted_score值，它只会选择最高得分。您还可以删除组中对sTbl.adjusted_score的引用，并且只能按日期排序：

CREATE PROCEDURE HighestReview @inpDate DATE AS (
    SELECT MAX(sTbl.adjusted_score) AS 'Max Score'
    FROM dbo.StandardizedReviews sTbl
    WHERE CAST(sTbl.Date AS DATE) = CAST(@inpDate AS DATE)
    GROUP BY sTbl.Date
)