首由用戶喜歡在一年的某月在某一個月和一年

我使用了下面的數據

user-id  date   song 
.......  .......  ...... 
1   2017-9-30  song1 
1   2017-9-10  song1 
1   2017-3-12  song2 
1   2017-9-01  song1 
1   2017-12-31  song1 
1   2017-09-12  song3 
1   2017-10-11  song1 
1   2017-09-09  song5 
1   2017-10-08  song4 
2   2017-07-12  song1 
2   2017-12-31  song3 
2   2017-10-12  song5 
3   2017-10-11  song1 
3   2017-10-09  song7 
3   2017-10-08  song2 
3   2017-07-12  song2

我試圖讓下面的輸出

user-id  year  month  song  count 
    ....... ......  ......  ..... ...... 
     1  2017  9   song1  3

我曾嘗試下面的查詢，但我在降序排列獲得的所有數據，我無法挑選最上面的數據

SELECT YEAR(date) AS year, MONTH(date) AS month,song,count(song) c 
FROM table where id=1 and year(dt)=2017 and month(dt)=9 
GROUP BY YEAR(date), MONTH(date) ,song ORDER BY c DESC

我甚至用

SELECT d.* 
FROM (SELECT id,year(date) y,month(date) m,count(song) as c, 
      ROW_NUMBER() OVER (PARTITION BY month(date) ORDER BY COUNT(song) DESC) as seqnum 
    FROM table where id=1 and month(date)=9 
    GROUP BY month(date),year(date) song 
    ) d 
WHERE seqnum = 1 
ORDER BY c, dt DESC ;

嘗試和它引發的錯誤作爲

錯誤在編譯時聲明：失敗：ParseException的線路5:37外來輸入 '歌' 期待）附近「 '

來源

2017-08-11 sri

第二個查詢在子查詢組中的年份（日期）後缺少逗號。（只是解決錯誤，而不是結果。 – xQbert

您可以使用LIMIT：

SELECT YEAR(date) AS year, MONTH(date) AS month,song,count(song) c 
FROM table 
GROUP BY YEAR(date), MONTH(date) ,song 
ORDER BY c DESC 
LIMIT 1

來源

2017-08-11 17:09:37 lad2025

首由用戶喜歡在一年的某月在某一個月和一年

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