mysql - 如何获得 SUM 以通过连接正确计算？

Question

所以我试图计算零件的数量、任务的数量、每项工作的数量以及制造每项工作所花费的时间，但我得到了一些奇怪的结果。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

我现在得到了准确的零件和任务编号，但 time_elapsed 总和不正确。问题可能是什么？

当我尝试使用 distinct 时，我得到了一个非常低的数字(当我在寻找接近 10,000 的东西时，我得到了一个 1 到 30 之间的数字。)

更新:这里是创建代码:

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 信息与工作相关联
• 工作有部分
• 零件有任务
• 任务分批进行
• batch_log 是一个包含批处理任务的所有开始和停止的表，它有一个 start_time 和一个 stop_time 以及一个 time_elapsed。

我正在尝试从每个 mf_job 的 batch_log 中获取所有 time_elapsed，其中一个字段中带有单词 backblaze 以及零件、任务和组件的数量。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