SQL - 仅显示一个表

Question

我使用以下代码作为查询从Excel中的sql server（对于ERP系统）返回数据。

我尝试根据Job.Job排序，仅选择desc（作业表）中的前1条记录。但是，我无法使用select top或limit函数。我还尝试了case when else中的where函数，但无法解决这个问题。

如果您能够了解如何修改以下代码来实现这一点，我将会很棒。

****只返回每个Material ****

的第一行

SELECT
  SO_Detail.Status,
  SO_Detail.Sales_Order,
  SO_Detail.SO_Line,
  SO_Detail.Material,
  SO_Detail.Rev,
  SO_Header.Customer_PO,
  SO_Detail.Order_Qty,
  Coalesce(Material_Location.On_Hand_Qty, 0),
  SO_Detail.Promised_Date,
  SO_Detail.Note_Text,
  Material.Description,
  Job.Status AS Status1,
  Job.Job 

FROM
  SO_Detail
  LEFT OUTER JOIN Material_Location ON SO_Detail.Material = Material_Location.Material
  LEFT OUTER JOIN SO_Header ON SO_Detail.Sales_Order = SO_Header.Sales_Order
  INNER JOIN Material ON Material.Material = SO_Detail.Material
  INNER JOIN Job ON SO_Detail.Material = Job.Part_Number

WHERE
  SO_Detail.Status = 'open'

ORDER BY
  SO_Detail.Sales_Order,
  SO_Detail.SO_Line,
  Job.Job desc

Answer 1

如果没有足够的信息，我会尝试在row_number中使用case函数或order by语句：

使用row_number函数和派生表：

select *
from
(SELECT
  SO_Detail.Status,
  SO_Detail.Sales_Order,
  SO_Detail.SO_Line,
  SO_Detail.Material,
  SO_Detail.Rev,
  SO_Header.Customer_PO,
  SO_Detail.Order_Qty,
  Coalesce(Material_Location.On_Hand_Qty, 0),
  SO_Detail.Promised_Date,
  SO_Detail.Note_Text,
  Material.Description,
  Job.Status AS Status1,
  Job.Job,
  row_number() over (partition by job.job order by job.job desc) rn

FROM
  SO_Detail
  LEFT OUTER JOIN Material_Location ON SO_Detail.Material = Material_Location.Material
  LEFT OUTER JOIN SO_Header ON SO_Detail.Sales_Order = SO_Header.Sales_Order
  INNER JOIN Material ON Material.Material = SO_Detail.Material
  INNER JOIN Job ON SO_Detail.Material = Job.Part_Number

WHERE
  SO_Detail.Status = 'open') t

where t.rn = 1

在case和order by中使用top 1语句：

SELECT TOP 1
  SO_Detail.Status,
  SO_Detail.Sales_Order,
  SO_Detail.SO_Line,
  SO_Detail.Material,
  SO_Detail.Rev,
  SO_Header.Customer_PO,
  SO_Detail.Order_Qty,
  Coalesce(Material_Location.On_Hand_Qty, 0),
  SO_Detail.Promised_Date,
  SO_Detail.Note_Text,
  Material.Description,
  Job.Status AS Status1,
  Job.Job 

FROM
  SO_Detail
  LEFT OUTER JOIN Material_Location ON SO_Detail.Material = Material_Location.Material
  LEFT OUTER JOIN SO_Header ON SO_Detail.Sales_Order = SO_Header.Sales_Order
  INNER JOIN Material ON Material.Material = SO_Detail.Material
  INNER JOIN Job ON SO_Detail.Material = Job.Part_Number

WHERE
  SO_Detail.Status = 'open'

ORDER BY
  SO_Detail.Sales_Order,
  SO_Detail.SO_Line,
  Job.Job desc,
  case when job.status = 'Complete' then 1 else 2 end

如果两者都不起作用，请提供更多详细信息，例如样本数据和表格。请注意，您有SQL-Server标记，limit是MySQL语法。

<强>更新：

我回来后发现你已经更新了你的问题。这将返回EACH材料的最新结果：

select *
from
(SELECT
  SO_Detail.Status,
  SO_Detail.Sales_Order,
  SO_Detail.SO_Line,
  SO_Detail.Material,
  SO_Detail.Rev,
  SO_Header.Customer_PO,
  SO_Detail.Order_Qty,
  Coalesce(Material_Location.On_Hand_Qty, 0),
  SO_Detail.Promised_Date,
  SO_Detail.Note_Text,
  Material.Description,
  Job.Status AS Status1,
  Job.Job ,
  row_number() over(partition by Material.Description order by Job.Job desc) rn

FROM
  SO_Detail
  LEFT OUTER JOIN Material_Location ON SO_Detail.Material = Material_Location.Material
  LEFT OUTER JOIN SO_Header ON SO_Detail.Sales_Order = SO_Header.Sales_Order
  INNER JOIN Material ON Material.Material = SO_Detail.Material
  INNER JOIN Job ON SO_Detail.Material = Job.Part_Number

WHERE
  SO_Detail.Status = 'open') t --name of derived query

where t.rn = 1
-- you can then add an order statement if you need. Keep in note 
-- I named the derived query t. So if you need to order by it'll need to be t.column

将来如果您发表评论并让回答者知道您已更新或有什么工作或没有，您可能会回答您的问题。此外，它只是排队等候消失在互联网领域。

Answer 2

对于Job表中的select desc top 1行，你可以写一个lil select语句

SELECT 
SO_Detail.Status, 
SO_Detail.Sales_Order, 
SO_Detail.SO_Line,
SO_Detail.Material,
SO_Detail.Rev,
SO_Header.Customer_PO,
SO_Detail.Order_Qty,
Coalesce(Material_Location.On_Hand_Qty, 0),
SO_Detail.Promised_Date,
SO_Detail.Note_Text,
Material.Description,
Job.Status AS Status1,
Job.Job 
FROM
SO_Detail
LEFT OUTER JOIN Material_Location ON SO_Detail.Material = Material_Location.Material
LEFT OUTER JOIN SO_Header ON SO_Detail.Sales_Order = SO_Header.Sales_Order
INNER JOIN Material ON Material.Material = SO_Detail.Material
INNER JOIN (Select top 1 * from Job order by Job.Job desc) as TempJob ON     SO_Detail.Material = TempJob.Part_Number
WHERE
SO_Detail.Status = 'open'
ORDER BY
SO_Detail.Sales_Order,
SO_Detail.SO_Line,
JobTemp.Job desc

Answer 3

您可以使用此查询。

df_EVENT5.columns.sort_values().values