MSSQL Groupby订购

我想编写一个查询，返回monthname并计算当月。MSSQL Groupby订购

SELECT DateName(month , DateAdd(month , MONTH(AE.BookingTimeStamp) , -1)) monthnames, count (BookingTimeStamp) totCount 
FROM BookingsAEItems AE WHERE BookingTimeStamp BETWEEN '1/12/2015' AND '1/12/2016' group by monthnames order by totCount

我越来越

无效的列名称MonthNames中“。

这是一个MSSQL查询。我在想什么！

来源

2016-01-20 makdu

您不能按MonthNames中，因为你的表没有名为monthnames的列。你必须按'DateName（month，DateAdd（month，MONTH（AE.BookingTimeStamp），-1））'进行分组。' –

感谢@zespri的信息，那么我怎样才能返回上述查询的计数与月份名称 – makdu

您可以简化并使查询更具可读性，如果您将'BookingTimeStamp'传递给'DateName'函数而不调用'DateAdd'函数。即'DateName（month，AE.BookingTimeStamp）as monthnames' –

感谢您的反馈...我得到它通过为在注释中给出的具有内查询工作

SELECT Months.monthnames, count(BookingTimeStamp) 
    FROM BookingsAEItems AE, (SELECT distinct DateName(month, DateAdd(month, MONTH(AE.BookingTimeStamp), -1)) 'monthnames' 
    FROM BookingsAEItems AE WHERE BookingTimeStamp BETWEEN '1/10/2015' AND '12/12/2016') Months 
    WHERE AE.BookingTimeStamp BETWEEN '1/10/2015' AND '12/12/2016' 
    And DateName(month, DateAdd(month, MONTH(AE.BookingTimeStamp), -1)) = Months.monthnames 
    group by Months.monthnames

来源

2016-01-21 00:50:44 makdu

您不能在GROUP BY子句中的SELECT子句中使用列别名。你将不得不重复整个表达式：

SELECT DateName(month , DateAdd(month , MONTH(AE.BookingTimeStamp) , -1)) monthnames, 
     count (BookingTimeStamp) totCount 
FROM  BookingsAEItems AE 
WHERE BookingTimeStamp BETWEEN '1/12/2015' AND '1/12/2016' 
group by DateName(month , DateAdd(month , MONTH(AE.BookingTimeStamp) , -1)) 
order by totCount

来源

2016-01-21 00:33:22

MSSQL Groupby订购

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