存储过程（T-SQL）连接多个表

Question

我目前正在Microsoft SQL Server Management Studio（SQL Server）中处理t-sql查询，该查询应在多个表上收集数据。 最后，我需要[OfferId]和[Label]。 您是否有关于将这4条查询语句写成1的想法？

SELECT a.OfferId AS [OfferId], a.OfferDataId AS [OfferDataId], b.DeliveryModelPoolId AS [DeliveryModelPoolId]
FROM [Offer].[Offer] a
INNER JOIN  [Offer].[OfferData] b
ON a.OfferDataId = b.OfferDataId

OfferId | OfferDataId | DeliveryModelPoolId
1 .......... | 1 .................. | 4

SELECT a.DeliveryModelPoolId AS [DeliveryModelPoolId], b.PoolId AS [PoolId]
FROM [Offer].[OfferData] a
INNER JOIN [Offer].[Pool] b
ON a.DeliveryModelPoolId = b.PoolId

DeliveryModelPoolId | PoolId
4 ................................ | 4

SELECT a.DeliveryModelId AS [DeliveryModelId]
FROM [Offer].[Delivery] a
INNER JOIN [Offer].[Pool] b
ON a.DeliveryModelPoolId = b.PoolId

DeliveryModelId
2
6

SELECT a.Label AS [Label]
FROM [Offer].[DeliveryModel] a
INNER JOIN [Offer].[DeliveryLabels] b
ON a.DeliveryModelId = b.DeliveryModelId

标签
服务中心
开车送

非常感谢！ :)

Answer 1

如果您打算重用查询，我将其放入视图中：

CREATE VIEW vWOfferData
AS   
SELECT a.offerID, dl.label
FROM [Offer].[Offer] a
INNER JOIN  [Offer].[OfferData] b
ON a.OfferDataId = b.OfferDataId
INNER JOIN [Offer].[Pool] p2
ON b.DeliveryModelPoolId = p2.PoolId
INNER JOIN [Offer].[Delivery] d3
ON d3.DeliveryModelPoolId = p2.PoolId
INNER JOIN [Offer].[DeliveryModel] dl
ON dl.DeliveryModelId = d3.DeliveryModelId

然后，您可以将其用作表格。 例如：

SELECT * FROM vWOfferData

Answer 2

您可以在一个查询中多次加入

select a.offerID, dl.label
FROM [Offer].[Offer] a
INNER JOIN  [Offer].[OfferData] b
ON a.OfferDataId = b.OfferDataId
inner join [Offer].[Pool] p2
ON b.DeliveryModelPoolId = p2.PoolId
inner join [Offer].[Delivery] d3
ON d3.DeliveryModelPoolId = p2.PoolId
inner join [Offer].[DeliveryModel] dl
  on dl.DeliveryModelId = d3.DeliveryModelId