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我正在尝试使以下 select 语句起作用。本质上，我试图为每个代理和日期获取一行，其中包含代理状态 = '登录'的最小（时间），代理状态 = '注销'的最大（时间），时间差异（最大（ time),min(time)) 和 sum(duration) 其中 agent-state = 'Ready'。

我当前的 SQL 语句对此并不完整，因为我刚开始只是获取正确的最小/最大时间值并碰壁。现在返回的是登录的最小时间，而不是注销的最大时间。

AGENT, DATE,         TIME,      DURATION,   AGENT_STATE
Alex, 2013-01-01,   07:25:37,   00:00:00,   Logged-in
Alex, 2013-01-01,   07:26:01,   00:24:48,   Ready
Alex, 2013-01-01,   07:54:20,   00:21:47,   Ready
Alex, 2013-01-01,   08:28:11,   00:03:00,   Ready
Alex, 2013-01-01,   08:34:11,   00:06:29,   Ready
Alex, 2013-01-01,   08:44:30,   00:05:14,   Ready
Alex, 2013-01-01,   08:53:29,   00:06:52,   Ready
Alex, 2013-01-01,   09:03:48,   00:12:13,   Ready
Alex, 2013-01-01,   09:31:56,   00:36:44,   Ready
Alex, 2013-01-01,   09:32:27,   14:58:51,   Logout
Alex, 2013-01-01,   10:11:37,   00:00:00,   Logged-in
Alex, 2013-01-01,   10:12:26,   00:54:44,   Ready
Alex, 2013-01-01,   11:09:28,   00:47:48,   Ready
Alex, 2013-01-01,   11:57:33,   00:16:54,   Ready
Alex, 2013-01-01,   12:15:15,   00:17:32,   Ready
Alex, 2013-01-01,   12:34:44,   00:13:32,   Ready
Alex, 2013-01-01,   12:51:04,   00:16:44,   Ready
Alex, 2013-01-01,   13:12:36,   00:31:38,   Ready
Alex, 2013-01-01,   13:49:46,   00:39:14,   Ready
Alex, 2013-01-01,   14:31:42,   00:28:45,   Ready
Alex, 2013-01-01,   15:00:27,   14:58:51,   Logout

SQL 语句：

select
 `agent`,
 `date`,
 if(`agent_state` = 'Logged-in', min(`time`), null) as `min_login`,
 if(`agent_state` = 'Logout', max(`time`),null) as `max_logout`
from
 t_cisco_agent_state_details
group by
 `agent`, `date`
order by
 `agent`, `date`, `time` asc;

感谢您提供任何帮助或建议。

吉姆

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1 回答 1

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你不能这样做。您为“其他”列获得空值的原因是，当您按代理和日期分组时，agent_state 不存在。如果您将 agent_state 添加到 group-by，您将获得每个代理/日期 3 行。这不是你想要的。

您需要一个子查询或几个自联接。尝试这样的事情：

SELECT agent,
       date,
       MIN(dur)                       AS total_duration,
       TIMEDIFF(MIN(maxt), MIN(mint)) AS time_difference_between_login_and_out,
       MIN(maxt)                      AS logout_time,
       MIN(mint)                      AS login_time
FROM   (SELECT agent,
               date,
               IF(agent_state = 'Ready', SUM(time), NULL)     AS dur,
               IF(agent_state = 'Logged-in', MIN(time), NULL) AS mint,
               IF(agent_state = 'Logout', MAX(time), NULL)    AS maxt,
               agent_state
        FROM   t_cisco_agent_state_details
        GROUP  BY agent,
                  date,
                  agent_state) AS subq
GROUP  BY agent,
          date

子查询为每个代理状态、代理和日期创建一行。然后，您可以使用仅按代理和日期分组的外部查询来提取您的时间。

于 2013-07-26T15:24:29.207 回答