MS SQL Server数据整合

Question

在办公室我们需要合并一个MS SQL表，我们应该在每个Quotaion数字中得到1行。参见表：https://drive.google.com/file/d/0B8AuHxQASEWyaEhfSVpDT3lIV1U/view?usp=sharing

已尝试使用SELECT DISTINCT，但无法获取。

SQL Server查询：

    SELECT DISTINCT ([QuotationNumber])
      ,[CreationDate]
      ,[QuotationDate]
      ,[CustomerNumber]
      ,[CustomerName]
      ,[SalesPersonName]
      ,[Rreg]
      ,[ProductDescription]
      ,[FamilyDescription]
      ,[NameVariant]
      ,[StringValue]
FROM [ABC].[dbo].[DEF]
WHERE [CreationDate] > "2017-05-08 00:00:00.000"
ORDER BY [CreationDate] DESC

Answer 1

如果保留所有列，则无法保留。要么从select中删除FamilyDescription、NameVariant、StringValue，要么在目标结果中为这些值添加新列。

SELECT DISTINCT ([QuotationNumber])
      ,[CreationDate]
      ,[QuotationDate]
      ,[CustomerNumber]
      ,[CustomerName]
      ,[SalesPersonName]
      ,[Rreg]
      ,[ProductDescription]
FROM [ABC].[dbo].[DEF]
WHERE [CreationDate] > "2017-05-08 00:00:00.000"
ORDER BY [CreationDate] DESC

为了保留所有值，您应该执行以下操作：

SELECT DISTINCT [QuotationNumber]
      ,[CreationDate]
      ,[QuotationDate]
      ,[CustomerNumber]
      ,[CustomerName]
      ,[SalesPersonName]
      ,[Rreg]
      ,[ProductDescription]
      ,MIN([FamilyDescription]) [FamilyDescription]
      ,MAX(CASE WHEN NameVariant = 'DT_residual' THEN StringValue END) [DT_residual]
      ,MAX(CASE WHEN NameVariant = 'DT_interestRateSum' THEN StringValue END) [DT_interestRateSum]
      ,MAX(CASE WHEN NameVariant = 'DT_depositValue' THEN StringValue END) [DT_depositValue]
FROM [ABC].[dbo].[DEF]
GROUP BY [QuotationNumber]
      ,[CreationDate]
      ,[QuotationDate]
      ,[CustomerNumber]
      ,[CustomerName]
      ,[SalesPersonName]
      ,[Rreg]
      ,[ProductDescription]
HAVING [CreationDate] > "2017-05-08 00:00:00.000"
ORDER BY [CreationDate] DESC