MySQL按天分組，不顯示當月結果

Question

如查詢所述，它檢索從6月到8月的記錄，但為什么結果只顯示到7月31日？，我有從2014-06-08到2014-08-07的記錄。 既然今天的八月到今天八月有問題嗎？

SELECT COUNT(*) AS, DATE(created)
FROM battle
WHERE player_id = 1234 AND enemy_id = 4567
AND created BETWEEN '2014-06-01 00:00:00' AND '2014-08-31 23:59:59'
GROUP BY DAY(created)
ORDER BY created ASC;

Answer 1

您正在按DAY(created)分組，這僅是一個月中的某天。 因此，它將6月1日，7月1日和8月1日合並為同一組，將6月2日，7月2日和8月2日合並為下一組，依此類推。

使用GROUP BY DATE(created)將月份包括在分組中。

Answer 2

如下更改查詢

使用GROUP BY DATE(created)而不是GROUP BY DAY(created)

    SELECT COUNT(*) AS, DATE(created)
    FROM battle
    WHERE player_id = 1234 AND enemy_id = 4567
    AND created BETWEEN '2014-06-01 00:00:00' AND '2014-08-31 23:59:59'
    GROUP BY DATE(created)
    ORDER BY created ASC;

Answer 3

嘗試這個：

SELECT COUNT(*) AS, DATE
FROM battle
WHERE player_id = 1234 AND enemy_id = 4567
AND Date BETWEEN '2014-06-01 00:00:00' AND '2014-08-31 23:59:59'
GROUP BY Date
ORDER BY Date ASC;