Question

正如查询所述，它从6月到8月检索记录，但为什么结果只显示到7月31日？我有2014-06-08到2014-08-07的记录。它是否有问题，因为截至今天的当月是八月？

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

您按DAY(created)进行分组，这只是该月的某一天。因此，它将6月1日，7月1日和8月1日合并为同一组，6月2日，7月2日和8月2日进入下一组，依此类推。

使用GROUP BY DATE(created)在分组中包含月份。

Answer 2

按如下方式更改您的查询

使用GROUP BY DATE(created)代替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

试试这个：

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;

MySQL组由DAY未显示当月的结果

3 个答案: