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我有一个相同的实时和开发数据库。

对每个数据库执行以下 SELECT 语句时，我得到不同的结果。

SELECT CASE WHEN (TIME_TO_SEC(c.duration) BETWEEN 0 AND 30) THEN '00:00:00 - 00:00:30'
WHEN (TIME_TO_SEC(c.duration) BETWEEN 31 AND 60) THEN '00:00:31 - 00:01:00'
WHEN (TIME_TO_SEC(c.duration) BETWEEN 61 AND 90) THEN '00:01:01 - 00:01:30'
WHEN (TIME_TO_SEC(c.duration) BETWEEN 91 AND 120) THEN '00:01:31 - 00:02:00'
WHEN (TIME_TO_SEC(c.duration) BETWEEN 121 AND 180) THEN '00:02:01 - 00:03:00'
WHEN (TIME_TO_SEC(c.duration) BETWEEN 181 AND 240) THEN '00:03:01 - 00:04:00'
WHEN (TIME_TO_SEC(c.duration) BETWEEN 241 AND 300) THEN '00:04:01 - 00:05:00'
WHEN (TIME_TO_SEC(c.duration) BETWEEN 301 AND 420) THEN '00:05:01 - 00:07:00'
WHEN (TIME_TO_SEC(c.duration) BETWEEN 421 AND 600) THEN '00:07:01 - 00:10:00'
ELSE 'Over 00:10:00'
END AS 'time_period',
COUNT(c.id) AS 'call_usage',
SEC_TO_TIME(SUM(TIME_TO_SEC(c.duration))) AS 'total_duration',
SUM(TIME_TO_SEC(c.duration)) / TIME_TO_SEC('838:59:59') AS 'percent_total'
FROM       call_detail c
INNER JOIN credit_unions cu ON c.credit_union_id = cu.id
WHERE      cu.abbreviation = 'REMOVED_FOR_SECURITY'
AND        c.call_date BETWEEN '2013-01-01' AND DATE_ADD('2013-01-31', INTERVAL 1 DAY)
GROUP BY   'time_period'
ORDER BY   'time_period' ASC

实时数据库给了我以下结果，这是正确的结果。

time_period call_usage  total_duration  percent_total
"00:00:00 - 00:00:30"   12033   83:01:42    0.0990
"00:00:31 - 00:01:00"   22947   291:34:48   0.3475
"00:01:01 - 00:01:30"   11137   236:53:24   0.2823
"00:01:31 - 00:02:00"   5904    175:13:54   0.2089
"00:02:01 - 00:03:00"   5970    247:05:24   0.2945
"00:03:01 - 00:04:00"   2591    150:58:54   0.1800
"00:04:01 - 00:05:00"   1359    101:49:24   0.1214
"00:05:01 - 00:07:00"   1197    116:25:36   0.1388
"00:07:01 - 00:10:00"   481     65:48:24    0.0784
"Over 00:10:00"         192     42:22:24    0.0505

开发数据库给了我以下结果，这是不正确的。

time_period call_usage  total_duration  percent_total
"00:00:31 - 00:01:00"   63811   858:59:59   1.8012

我无法弄清楚为什么/如何发生这种情况。

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