Question

我对SQL很陌生，无法为我想要完成的任务找到合适的命令。

我们有一个票务系统，允许我们暂停机票。我正在尝试生成一个报告，该报告仅显示故障单处于非保持状态的时间。

我在MySQL工作台中运行查询。

以下是我收集实现目标所需信息的查询：

select ID, HD_TICKET_ID, TIMESTAMP,

case when DESCRIPTION LIKE '%opened" to "hold%' then 'hold' else 'active' end as state,

DESCRIPTION

from H

D_TICKET_CHANGE
    where HD_TICKET_ID = 7715
    order by TIMESTAMP

以下是我的结果：

ID  HD_TICKET_ID    TIMESTAMP   state   DESCRIPTION
25040   7715    "2014-08-06 16:39:29"   active  "Ticket Created
25042   7715    "2014-08-06 17:13:15"   active  "Changed ticket Status from ""New"" to ""Opened"".
25078   7715    "2014-08-07 10:38:28"   hold    "Changed ticket Status from ""Opened"" to ""Hold"".
25081   7715    "2014-08-07 10:54:55"   active  "Changed assest name"
25201   7715    "2014-08-11 08:24:56"   active  "Changed ticket Title. Changed ticket Status from ""Hold"" to ""Opened"".
25202   7715    "2014-08-11 08:25:08"   hold    "Changed ticket Status from ""Opened"" to ""Hold"".
25341   7715    "2014-08-13 10:56:00"   active  "Changed ticket Status from ""Hold"" to ""Opened"".
25373   7715    "2014-08-13 13:41:01"   hold    "Changed ticket Status from ""Opened"" to ""Hold"".
25551   7715    "2014-08-15 13:54:21"   active  "Added resolution text. Changed ticket Status from""Hold"" to ""Closed"".

此时我被困住了。我如何将时间从1添加到3，因为票证处于活动状态并且需要报告该时间，但是因为票证处于暂停状态而减去3到4，并根据活动继续此添加或减法到这些结果的结尾vs hold？

Answer 1

您需要获取下一个时间戳值。然后你可以通过聚合做你想做的事。我喜欢在MySQL中使用相关子查询：

select ID, HD_TICKET_ID, TIMESTAMP,
       (case when DESCRIPTION LIKE '%opened" to "hold%' then 'hold'
             else 'active'
        end) as state, DESCRIPTION,
       (select tc2.timestamp
        from HD_TICKET_CHANGE tc2
        where tc2.timestamp > tc.timestamp
        order by tc2.timestamp
        limit 1
       ) as next_timestamp
from HD_TICKET_CHANGE tc
where HD_TICKET_ID = 7715
order by TIMESTAMP;

然后，您可以将结果添加为：

select sum((case when state = 'active' then 1 else -1 end) *
           timestampdiff(second, next_timestamp, timestamp)
          ) as TimeInSeconds
from (select ID, HD_TICKET_ID, TIMESTAMP,
             (case when DESCRIPTION LIKE '%opened" to "hold%' then 'hold'
                   else 'active'
              end) as state, DESCRIPTION,
             (select tc2.timestamp
              from HD_TICKET_CHANGE tc2
              where tc2.timestamp > tc.timestamp and tc2.HD_TICKET_ID = tc.HD_TICKET_ID
              order by tc2.timestamp
              limit 1
             ) as next_timestamp
      from HD_TICKET_CHANGE tc
      where HD_TICKET_ID = 7715
     ) t;

这忽略了最后的时间戳，因为没有＆＃34; next＆＃34;价值和你的问题没有说明在这种情况下该做什么。

MySql运行时间总计取决于票务的状态

1 个答案: