SQl：按月和年分組

Question

嗨，我的代碼不起作用，我試圖按年份和月份對博客條目進行分組，這是我的SQL

SELECT * FROM(
    SELECT WP_BlogEntries.BlogEntryID, WP_BlogEntries.AddedDate,
        WP_BlogEntries.AddedBy, WP_BlogEntries.BlogID, 
        WP_BlogEntries.Title, WP_BlogEntries.Description, WP_BlogEntries.Body,
        WP_BlogEntries.ReleaseDate, WP_BlogEntries.ExpireDate,
        WP_BlogEntries.Approved, WP_BlogEntries.Listed,
        WP_BlogEntries.CommentsEnabled, WP_BlogEntries.OnlyForMembers,
        WP_BlogEntries.ViewCount, WP_BlogEntries.Votes, 
        WP_BlogEntries.TotalRating
    FROM WP_BlogEntries
    WHERE WP_BlogEntries.ReleaseDate < GETDATE()
        AND WP_BlogEntries.ExpireDate > GETDATE()
        AND Approved = 1
        AND Listed = 1
        AND WP_BlogEntries.BlogID = @BlogID) MonthEntries 
    GROUP BY YEAR(ReleaseDate), MONTH(ReleaseDate)

Answer 1

了解錯誤消息將很有幫助。

如果指定GROUP BY則不能執行SELECT * FROM 。

唯一有效的列是GROUP BY或聚合函數中的列。

如果按年和月分組，則每一行將包含一年和一個月，SQL無法知道要顯示哪些其他列，因為可能會有不止一個。 （例如，一個月內有兩個博客條目）

您是說要ORDER BY嗎？

Answer 2

像這樣的事情： select convert(varchar(50),YEAR(date)) +'/'+convert (varchar(50), MONTH(date)) ,Name , COUNT( Name) ,[DATE] from table1 group by convert(varchar(50),YEAR(date)) +'/'+convert (varchar(50), MONTH(date)) ,Name,[date] order by [Date] Desc