如何使用连接正确计算SUM？

Question

所以我试图计算零件数量,任务数量,每个工作的数量以及制造每项工作所花费的时间,但我得到了一些时髦的结果.如果我运行这个:

SELECT
  j.id, 
    mf.special_instructions,
  count(distinct p.id) as number_of_different_parts,
  count(distinct t.id) as number_of_tasks,
  SUM(distinct j.quantity) as number_of_assemblies,
  SUM(l.time_elapsed) as time_elapsed

FROM
  sugarcrm2.mf_job mf
INNER JOIN ramses.jobs j on
  mf.id = j.mf_job_id
INNER JOIN ramses.parts p on
  j.id = p.job_id
INNER JOIN ramses.tasks t on
  p.id = t.part_id
INNER JOIN ramses.batch_log l on
  t.batch_id = l.batch_id

WHERE 
  mf.job_description                LIKE "%BACKBLAZE%" OR
  mf.customer_name                  LIKE "%BACKBLAZE%" OR
  mf.customer_ref                   LIKE "%BACKBLAZE%" OR
  mf.technical_company_name LIKE "%BACKBLAZE%" OR
  mf.description                        LIKE "%BACKBLAZE%" OR
  mf.name                                   LIKE "%BACKBLAZE%" OR
  mf.enclosure_style                LIKE "%BACKBLAZE%" OR 
    mf.special_instructions     LIKE "%BACKBLAZE%"
Group by j.id

我现在得到准确的零件和任务数字,但time_elapsed总和不正确.问题是什么？

当我尝试它时,distinct我得到一个低数字(当我正在寻找接近10,000的东西时,就像1到30之间的东西.)

更新:这是创建代码:

http://pastebin.com/nbhU9rYh

http://pastebin.com/tdmAkNr4

http://pastebin.com/0TFCUaeQ

http://pastebin.com/fugr8C9U

http://pastebin.com/Zq0bKG2L

http://pastebin.com/k5rESUrq

关系是这样的:

• mf_job信息链接到作业
• 工作有部分
• 零件有任务
• 任务分批进行
• batch_log是一个包含批量任务的所有启动和停止的表,它有一个start_time,一个stop_time和一个time_elapsed.

我试图从每个mf_job的batch_log获取所有time_loglap,其中一个字段中包含backblaze一词以及部件,任务和程序集的数量.这一切都需要按job.id或mf_job.id分组

Answer 1

尝试将查询重写为：

SELECT
  j.id, 
  mf.special_instructions,
  count(p.id) as number_of_different_parts,
  count(t.id) as number_of_tasks,
  SUM(j.quantity) as number_of_assemblies,
  SEC_TO_TIME(SUM(l.seconds_elapsed)) as time_elapsed

FROM
  sugarcrm2.mf_job mf
INNER JOIN ramses.jobs j on
  mf.id = j.mf_job_id
INNER JOIN ramses.parts p on
  j.id = p.job_id
INNER JOIN ramses.tasks t on
  p.id = t.part_id
INNER JOIN (
            SELECT rl.batch_id
                  , SUM(TIME_TO_SEC(rl.time_elapsed)) as seconds_elapsed
            FROM ramses.batch_log rl 
            GROUP BY rl.batch_id
            ) l ON (t.batch_id = l.batch_id)

WHERE 
  mf.job_description                LIKE "%BACKBLAZE%" OR
  mf.customer_name                  LIKE "%BACKBLAZE%" OR
  mf.customer_ref                   LIKE "%BACKBLAZE%" OR
  mf.technical_company_name         LIKE "%BACKBLAZE%" OR
  mf.description                    LIKE "%BACKBLAZE%" OR
  mf.name                           LIKE "%BACKBLAZE%" OR
  mf.enclosure_style                LIKE "%BACKBLAZE%" OR 
  mf.special_instructions           LIKE "%BACKBLAZE%"
GROUP BY j.id WITH ROLLUP