MSSQL Groupby訂購

我想編寫一個查詢，返回monthname並計算當月。MSSQL Groupby訂購

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

我越來越

無效的列名稱MonthNames中「。

這是一個MSSQL查詢。我在想什麼！

來源

2016-01-20 makdu

您不能按MonthNames中，因爲你的表沒有名爲monthnames的列。你必須按'DateName（month，DateAdd（month，MONTH（AE.BookingTimeStamp），-1））'進行分組。' –

感謝@zespri的信息，那麼我怎樣才能返回上述查詢的計數與月份名稱 – makdu

您可以簡化並使查詢更具可讀性，如果您將'BookingTimeStamp'傳遞給'DateName'函數而不調用'DateAdd'函數。即'DateName（month，AE.BookingTimeStamp）as monthnames' –

感謝您的反饋...我得到它通過爲在註釋中給出的具有內查詢工作

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

來源

2016-01-21 00:50:44 makdu

您不能在GROUP BY子句中的SELECT子句中使用列別名。你將不得不重複整個表達式：

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

來源

2016-01-21 00:33:22

MSSQL Groupby訂購

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