Sql 嗯，最小。。。或者将其分组在“GROUPBY子句”中。抱歉，如果您不懂我的英语，它不是我的第一语言。因此，在聚合和分组表达式中，SELECT子句只能包含聚合和分组表达式。[Select子句=，date]，我对此不太了解，但当我从一开始就使用这个查询时，没有

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嗯，最小。。。或者将其分组在“GROUPBY子句”中。抱歉，如果您不懂我的英语，它不是我的第一语言。因此，

在聚合和分组表达式中，SELECT子句只能包含聚合和分组表达式。[Select子句=，date]

，我对此不太了解，但当我从一开始就使用这个查询时，没有datepart内容，需要内部联接是因为我无法将MAX（..）与SUM（..）结合起来因为MAX只会给出一个结果，SUM会给出更多的结果，因为有时数据库中有多行具有相同的日期！问题是我必须按表达式分组，而不是按别名分组，我将使用正确的查询对其进行编辑。而且，因为sum和max都是聚合操作数，所以它们可以一起工作。哇，真是太酷了！也许我之前的问题是因为我没有使用datepart时按日期分组，或者它仍然可以同时使用max和sum？您发布的第二个查询有一个问题，即您没有按“datepart（wk，date）”进行搜索，因此这会导致两个不同的计数结果。同样，在第二个查询中，您是按天分组的，而不是按要求按周分组的。使用摸索操作数时最重要的一点是，要返回的每个变量的结果数必须相同，使用摸索操作数，如max、count、min。。。或者将其分组在“GROUPBY子句”中。对不起，我的英语如果你不懂的话，那不是我的第一语言。

var querytest = "SELECT DATEPART(wk, date), sum((kg * rep * sett)) as weight, 
sum(kg / max * rep * sett) as avg, sum((rep * sett)) as reps 
FROM Test WHERE date between @0 and @1 AND exercise < 4 GROUP BY DATEPART(wk, date)";   

                                                 ^

var querythiss = "SELECT DATEPART(wk, date), SUM(kg * rep * sett) as weight, SUM(kg / max * rep * sett) as avg, SUM(rep * sett) as reps, " +
                " t.date, pk.peak FROM Test t INNER JOIN (SELECT MAX(kg / max) as peak, date FROM Test WHERE date BETWEEN @0 AND " +
                " @1 AND exercise < 4 group by date) as pk on t.date = pk.date WHERE t.date BETWEEN @0 AND @1 AND exercise < 4 GROUP " +
                "BY t.date, pk.peak";

SELECT DATEPART(wk, date),
    SUM(kg * rep * sett) as weight, 
    SUM(kg / max * rep * sett) as avg,   
    SUM(rep * sett) as reps,
    t.date, pk.peak 
FROM Test t INNER JOIN 
(
    SELECT MAX(kg / max) as peak, date 
    FROM Test 
    WHERE date BETWEEN @0 AND @1 
    AND exercise < 4 
    GROUP BY date
) as pk on t.date = pk.date 
WHERE t.date BETWEEN @0 AND @1 AND exercise < 4
GROUP BY t.date, pk.peak

SELECT pk.dateWeek,
    SUM(kg * rep * sett) as weight, 
    SUM(kg / max * rep * sett) as avg,   
    SUM(rep * sett) as reps,
    pk.peak 
FROM Test t 
INNER JOIN 
(
    SELECT MAX(kg / max) as peak, DATEPART(wk, date) as dateWeek 
    FROM Test 
    WHERE date BETWEEN @0 AND @1 
    AND exercise < 4 
    GROUP BY DATEPART(wk, date)
) as pk on  DATEPART(wk, t.date) = pk.dateWeek 
WHERE date BETWEEN @0 AND @1 
AND exercise < 4
GROUP BY  pk.dateWeek, pk.peak

SELECT DATEPART(wk, date) as wknumber, sum((kg * rep * sett)) as weight, 
sum(kg / max * rep * sett) as avg, sum((rep * sett)) as reps,
max(kg / max) as peak
FROM Test WHERE date between @0 and @1 AND exercise < 4 GROUP BY DATEPART(wk, date)