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我有一个生成结果集的SELECT语句(e) 。我想将结果集减少到只有最新版本的数据，所以我WHERE在我的选择末尾放了一个子句，内容为WHERE e.[Version] = (SELECT MAX(e.[Version]) FROM [dbo].[d_bpcunits]). 然后我将JOIN另一个表(f) LEFT JOIN [dbo].[d_bpc] as f on e.[bu_product_code] = f.idbpc编辑到记录集，因为我希望从主表中显示一致的数据，而不是用户输入的不一致信息。然后，我使用(f)中的许多字段替换(e)中的字段，这应该会产生我想要的干净数据集。

这是我打算UNION ALL一起使用的 4 个结果集之一，以使我能够在大型分析中使用。

我正在运行 SQL Server 14.0。

我的选择查询如下：

SELECT
e.[bu_product_code] AS ProductCode
,f.[bpc_desc] AS Description
,NULL AS BPCCountry
,f.[bpc_business_nature] AS BusinessNature
,e.[bu_year_month] AS YearMonth
,f.[bpc_active_ingredient] AS ActiveIngredient
,f.[bpc_ai_content] AS AIContent
,f.[bpc_formulation_type] AS FormulationType
,f.[bpc_brand] AS Brand
,f.[bpc_min_pack] AS MinPack
,f.[bpc_product_category] AS ProductCategory
,e.[bu_entity] AS Entity
,e.[bu_ship_to_ctry] AS ShipToCtry
,e.[bu_ccy] AS CCY
,e.[bu_data_type] AS DataType
,NULL AS ProductType
,e.[bu_latest] AS Latest
,e.[Version] AS Version
,e.[bu_account] AS UAccount
,e.[bu_entity_code] AS UEntityCode
,e.[bu_interco_code] AS UIntercoCode
,e.[bu_pic] AS Upic
,e.[bu_source] AS USource
,e.[bu_sales_rep] AS USalesRep
,e.[bu_qty_type] AS UQtyType
,e.[bu_amount] AS UAmount
FROM
[dbo].[d_bpcunits] e
LEFT JOIN [dbo].[d_bpc] as f on e.[bu_product_code] = f.idbpc
WHERE e.[Version] = (SELECT MAX(e.[Version]) FROM [dbo].[d_bpcunits])

提前感谢您的帮助。

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1 回答 1

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我在您的查询中看到的唯一问题是最后一行

  --SELECT MAX(e.[Version]) FROM [dbo].[d_bpcunits]

需要更改为

    SELECT MAX([Version]) FROM [dbo].[d_bpcunits]

然后查询变为

SELECT
e.[bu_product_code] AS ProductCode
,f.[bpc_desc] AS Description
,NULL AS BPCCountry
,f.[bpc_business_nature] AS BusinessNature
,e.[bu_year_month] AS YearMonth
,f.[bpc_active_ingredient] AS ActiveIngredient
,f.[bpc_ai_content] AS AIContent
,f.[bpc_formulation_type] AS FormulationType
,f.[bpc_brand] AS Brand
,f.[bpc_min_pack] AS MinPack
,f.[bpc_product_category] AS ProductCategory
,e.[bu_entity] AS Entity
,e.[bu_ship_to_ctry] AS ShipToCtry
,e.[bu_ccy] AS CCY
,e.[bu_data_type] AS DataType
,NULL AS ProductType
,e.[bu_latest] AS Latest
,e.[Version] AS Version
,e.[bu_account] AS UAccount
,e.[bu_entity_code] AS UEntityCode
,e.[bu_interco_code] AS UIntercoCode
,e.[bu_pic] AS Upic
,e.[bu_source] AS USource
,e.[bu_sales_rep] AS USalesRep
,e.[bu_qty_type] AS UQtyType
,e.[bu_amount] AS UAmount
FROM
[dbo].[d_bpcunits] e
LEFT JOIN [dbo].[d_bpc] as f on e.[bu_product_code] = f.idbpc
WHERE e.[Version] = (SELECT MAX([Version]) FROM [dbo].[d_bpcunits])
于 2020-09-10T17:58:44.210 回答