我有此查询根据某些条件选择一些字段：
SELECT [Qty].[plant_no]
,[Qty].[ord_no]
,[Qty].[form_no]
,[Qty].[form_var]
,[Qty].[form_part]
,[Qty].[res_no]
,isnull([RFORMPARTS].[cost_center],'_') as [RFORMPARTS_cost_center]
,[BARTICLES].[wght_net] AS [Unit_kg]
,CASE
WHEN [Qty].[qty_unit] IN ('KG','KG-C') THEN [Qty].[fb_qty]
WHEN [Qty].[qty_unit] = 'NR' THEN [Qty].[fb_qty]*[BARTICLES].[wght_net]
END AS [Qty_KG]
FROM [dbo].[E00_PRD_003] AS [Qty]
LEFT JOIN [dbo].[RFORMPARTS] as [RFORMPARTS] ON [RFORMPARTS].[form_no] = [Qty].[form_no] AND [RFORMPARTS].[form_var] = [Qty].[form_var] and [RFORMPARTS].[form_part] = [qty].form_part
LEFT JOIN [dbo].[BARTICLES] AS [BARTICLES] ON [BARTICLES].[art_no] = [Qty].[form_no]
WHERE CONVERT(VARCHAR(10),[Qty].[date_start],112) >= 20180101 AND [Qty].[in_out] = '02' AND LEFT([Qty].[res_no],2) <> 'SL'
我想获得每个[Qty]。[ord_no]和[Qty]。[form_no]的最大Qty.form_part，同时保留所有选定字段。有可能和一群人一起做吗？如果是，我该怎么办？如果没有，还有其他方法吗？
如果我了解您的要求，一种选择是创建一个子查询，该子查询返回max每个ord_no＆form_no对的，您将使用Group By它，但仅在子查询中，然后max form_part在外部查询结果中使用子查询的值，如果您只需要具有每个ord_no＆form_no对最大值的行，则可以INNER JOIN向子查询的条件添加一个条件，并添加form_part值的联接，以便它也联接在最大值上，这将过滤掉所有多余的条件具有相同ord_no＆form_no组合且小于最大值的行form_part：
SELECT [Qty].[plant_no]
,[Qty].[ord_no]
,[Qty].[form_no]
,[Qty].[form_var]
--,[Qty].[form_part] --Replaced with the subquery max
,[maxVals].[form_part] --Max values returned by subquery
,[Qty].[res_no]
,isnull([RFORMPARTS].[cost_center],'_') as [RFORMPARTS_cost_center]
,[BARTICLES].[wght_net] AS [Unit_kg]
,CASE
WHEN [Qty].[qty_unit] IN ('KG','KG-C') THEN [Qty].[fb_qty]
WHEN [Qty].[qty_unit] = 'NR' THEN [Qty].[fb_qty]*[BARTICLES].[wght_net]
END AS [Qty_KG]
FROM [dbo].[E00_PRD_003] AS [Qty]
INNER JOIN --INNER JOIN the max values on the Qty table
(
SELECT [ord_no], [form_no], MAX([form_part]) AS [form_part]
FROM [dbo].[E00_PRD_003]
GROUP BY [ord_no], [form_no]
) AS maxVals
ON [maxVals].[ord_no] = [Qty].[ord_no] AND [maxVals].[form_no] = [Qty].[form_no]
AND [maxVals].[form_part] = [Qty].[form_part]
LEFT JOIN [dbo].[RFORMPARTS] as [RFORMPARTS] ON [RFORMPARTS].[form_no] = [Qty].[form_no] AND [RFORMPARTS].[form_var] = [Qty].[form_var] and [RFORMPARTS].[form_part] = [qty].form_part
LEFT JOIN [dbo].[BARTICLES] AS [BARTICLES] ON [BARTICLES].[art_no] = [Qty].[form_no]
WHERE CONVERT(VARCHAR(10),[Qty].[date_start],112) >= 20180101 AND [Qty].[in_out] = '02' AND LEFT([Qty].[res_no],2) <> 'SL'
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我来说两句