Question

我想根据同月汇总数量。我已经完成了添加它们的查询，但问题是它只添加相同日期的同一个月。这是我对八月份的查询。

SELECT 
    [Purchased Product], 
    SUM(CONVERT(INT, [Purchased Quantity])) AS [Purchased Quantity],
    [Purchased Date]
FROM  
    StudentPurchasedHistoryTable
WHERE 
    DATENAME(month, [Purchased Date]) = 'August' 
GROUP BY 
    [Purchased Product], [Purchased Date]

显示：

Purchased Product   Purchased Quantity  Purchased Date
Zesto               1                   2015-08-03 20:03:00.000
Zesto               10                  2015-08-08 00:00:00.000
Zesto               1                   2015-08-09 19:47:00.000
Mineral Water       1                   2015-08-09 19:48:00.000
Mineral Water       1                   2015-08-09 19:49:00.000

这是我查询仅显示月份名称。

SELECT 
    [Purchased Product], 
    SUM(CONVERT(INT, [Purchased Quantity])) AS [Purchased Quantity],
    DATENAME(MONTH, [Purchased Date]) AS [Purchased Date]
FROM
    StudentPurchasedHistoryTable
WHERE 
    DATENAME(MONTH, [Purchased Date]) = 'August'
GROUP BY
    [Purchased Product], [Purchased Date]

这就是它显示的内容

Purchased Product   Purchased Quantity  Purchased Date
Zesto                1                  August
Zesto                10                 August
Zesto                1                  August
Mineral Water        1                  August
Mineral Water        1                  August

如何将购买数量与同月相加，而不管某个月的日期和时间

Answer 1

如果您只选择一个月，请从group by删除日期或按月名汇总：

SELECT [Purchased Product], sum(CONVERT(INT, [Purchased Quantity])) as [Purchased Quantity],
       datename(month, [Purchased Date])  AS [Purchased Date]
from StudentPurchasedHistoryTable
WHERE DATENAME(month, [Purchased Date]) = 'August'
group by [Purchased Product], datename(month, [Purchased Date]);

我不建议在数据中已有的列之后在select中命名表达式。它可能导致混乱。

Answer 2

每年都有一个八月，所以当你想按月分组时，你实际上想要按月和年分组。 2014年8月与2015年8月混在一起会很糟糕。

试试这个：

List

在sql中添加相同的月份

2 个答案: