Question

我有一个返回3列的查询，如下所示：

Second ref   Code    Description 
10/14/0094  ZW01008  Side Support Bracket PM1662TAA
10/14/0095  ZW01008  Rear Hook LH PM1664TAA
10/14/0095  ZW01008  Rear Hook LH PM1664TAA
10/14/0095  ZW01008  Rear Hook RH PM1663TAA
10/14/0095  ZW01008  Rear Hook RH PM1663TAA 
10/14/0096  ZW01008  Sunblind Brackets PM1665TAA
10/14/0098  ZW01008  NEW TOOL TRIAL 300 HALFS 600 WEDGES
10/14/0100  ZW01008  NEW TOOL TRIAL WATER RESERVOIR

如果有多个行具有相同的SecondRef我希望将这些行组合在一起，并且只显示Description个值中的一个，因为它们将是彼此的变体，或者组合一条记录中所有4条记录的值。

以下是我用来获取示例的查询：

SELECT  AllocationBalance.SecondRef, StockItem.Code, BomRecord.Description
FROM    AllocationBalance AS AllocationBalance 
INNER JOIN StockItem AS StockItem ON AllocationBalance.ItemID = StockItem.ItemID
INNER JOIN BomAllocation ON AllocationBalance.Reference = BomAllocation.AllocationNumber 
INNER JOIN WopOrder ON BomAllocation.BomAllocationID = WopOrder.BomAllocationID 
INNER JOIN BomRecord ON WopOrder.BomRecordID = BomRecord.BomRecordID
WHERE     (AllocationBalance.RecipientName = 'BOM') AND (StockItem.Code LIKE '%ZW01008%')

Answer 1

只需使用GROUP BY和MAX或MIN：

SELECT AllocationBalance.SecondRef, 
       StockItem.Code, 
       MAX(dbo.BomRecord.Description) as Description
FROM [YOUR_TABLES] -- including joins
WHERE (AllocationBalance.RecipientName = 'BOM') AND (StockItem.Code LIKE '%ZW01008%')
GROUP BY AllocationBalance.SecondRef, StockItem.Code

因此，按前两列进行分组并获取描述列中的最后一个/最高值。

使用MAX代替MIN会覆盖您，因为@Gordon可能会在评论中提及空白描述。

Answer 2

尝试DISTINCT。如果我理解正确 - 这就是你需要的。

对行进行分组并组合数据

2 个答案: