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我对 SQL 比较陌生——上周才开始使用它。我在通过基于连接的索引将 2 个表连接在一起时遇到了一些问题（我可以这样做，但它会显示几个日期）然后按最大日期过滤它

请参阅下面的第一个版本，该版本显示了连接在一起的表格。我需要加入两个表。INVENTORY_TRANSACTION_HIST2（作业）inventory_transaction_hist（与项目细节相关的更多细节）

这些表之间没有关联，因此我不得不从几个字段中构建连接的表： part_no||lot_batch_no||serial_no||location_no 用于两个表之间的关联。

order_no||release_no||sequence_no||line_item_no 仅与第二个表相关并创建过滤日期所需的索引

select
to_char(job.dated,'dd/mm/yyyy hh:mm:ss') date_issued,
job.userid,
job.part_no,
job.quantity,
job.lot_batch_no,
job.serial_no,
job.cost,
job.quantity* job.cost total_cost,
job.source note,
hist.dated,
hist.order_no,
hist.release_no,
hist.sequence_no,
hist.line_item_no

from
inventory_transaction_job job
left join inventory_transaction_hist hist
on job.part_no||job.lot_batch_no||job.serial_no||job.location_no = hist.part_no||hist.lot_batch_no||hist.serial_no||hist.location_no
where (job.source like UPPER('%'||'&Job_No'||'%') or job.source like LOWER('%'||'&Job_No'||'%'))
and hist.transaction LIKE '%INM-IN%'
and hist.direction LIKE '+'
order by job.part_no

我需要按历史上最近的日期进一步划分。表（因为某些批次/序列号仅显示为“*”，因此可以针对每个显示多个订单号 - 我只想显示这些订单的最新订单）

我已经尝试了以下和其他一些变化，但我似乎无法让它工作。

select
to_char(job.dated,'dd/mm/yyyy hh:mm:ss') date_issued,
job.userid user_id,
job.part_no,
job.quantity,
job.lot_batch_no,
job.serial_no,
job.cost,
job.quantity* job.cost total_cost,
job.source note,
hist.dated,
hist.order_no,
hist.release_no,
hist.sequence_no,
hist.line_item_no

from
inventory_transaction_job job
left join inventory_transaction_hist hist
on job.part_no||job.lot_batch_no||job.serial_no||job.location_no = hist.part_no||hist.lot_batch_no||hist.serial_no||hist.location_no
where (job.source like UPPER('%'||'&Job_No'||'%') or job.source like LOWER('%'||'&Job_No'||'%'))
and hist.transaction LIKE '%INM-IN%'
and hist.direction LIKE '+'
and job.order_no||job.sequence_no||job.line_item_no IN
(SELECT
hist2.order_no||hist2.sequence_no||hist2.line_item_no
FROM inventory_transaction_hist hist2
WHERE job.part_no||job.lot_batch_no||job.serial_no||job.location_no LIKE hist2.part_no||hist2.lot_batch_no||hist2.serial_no||hist2.location_no
ORDER BY hist2.Dated DESC LIMIT 1)

任何帮助将不胜感激。

4

2 回答 2

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First, as mentioned in a comment, you should do joins on the individual columns connected by "ands" rather than trying to concatenate them together. The concatenation is clever, but it makes it much harder for the query optimizer to do its job, for instance.

I got the idea that you want the most recent date from the history table for different groups. I calculate the max date using an analytic function, and then use that for the comparison.

The final query looks like this:

select to_char(job.dated,'dd/mm/yyyy hh:mm:ss') date_issued, job.userid user_id, job.part_no,
        job.quantity, job.lot_batch_no, job.serial_no, job.cost, job.quantity* job.cost total_cost,
        job.source note, hist.dated,  hist.order_no, hist.release_no, hist.sequence_no, hist.line_item_no
from inventory_transaction_job job left join
     (select hist.*,
             MAX(dated) over (PARTITION by hist2.part_no, hist2.lot_batch_no, hist2.serial_no, hist2.location_no) as maxdated
      from inventory_transaction_hist hist
     ) hist
     on job.part_no = hist.part_no and
        job.lot_batch_no = hist.lot_batch_no and
        job.serial_no = hist.serial_no and
        job.location_no = hist.location_no join
     (SELECT hist2.order_no, hist2.lot_batch_no, hist2.serial_no, hist2.location_no, hist2.sequence_no, hist2.line_item_no
      FROM inventory_transaction_hist hist2
      ORDER BY hist2.Dated DESC
      LIMIT 1
     )
where (job.source like UPPER('%'||'&Job_No'||'%') or job.source like LOWER('%'||'&Job_No'||'%')) and
      hist.transaction LIKE '%INM-IN%' and
      hist.direction LIKE '+' and
      hist.dated = hist.maxdated
于 2012-07-24T20:24:58.120 回答
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非常感谢您的帮助 - 非常感谢！进行了一些调整以使其按我的意愿工作。如果您发现任何可以更改以提高搜索性能的内容，请告诉我！

select
to_char(job.dated,'dd/mm/yyyy hh:mm:ss') date_issued,
job.userid user_id,
job.part_no,
job.quantity,
job.lot_batch_no,
job.serial_no,
job.cost,
job.quantity* job.cost total_cost,
job.source note,
to_char(hist.dated,'dd/mm/yyyy hh:mm:ss') date_PO_received,
hist.order_no,
hist.release_no,
hist.sequence_no,
hist.line_item_no

from
INVENTORY_TRANSACTION_job job
left join (select hist.*, MAX(hist.dated) over (PARTITION by hist.transaction, hist.direction, hist.part_no, hist.serial_no, hist.lot_batch_no order by hist.dated desc) as maxdated
from inventory_transaction_hist hist
) hist
on
job.part_no = hist.part_no and
job.lot_batch_no = hist.lot_batch_no and
job.serial_no = hist.serial_no and
hist.dated = hist.maxdated
where (job.source like UPPER('%'||'&Job_No'||'%') or job.source like LOWER('%'||'&Job_No'||'%'))
and hist.transaction LIKE '%INM-IN%'
and hist.direction = '+'

再次感谢杰米

于 2012-07-25T17:40:50.777 回答