SQL從一個組的兩個表中選擇最大ID

我想選擇一組符合特定條件的Ids，並且我努力編寫將返回我想要的SQL查詢。SQL從一個組的兩個表中選擇最大ID

表1：

SelloutPriceID|SiteID|CountryCode|CurrencyCode|RequestID|RequestDateTime|InsertedDateTime 
666|1002|BE|EUR|12504|2016-09-02 11:57:12.0000000|2016-11-14 14:27:35.980 
667|1002|BE|EUR|12501|2016-09-02 11:57:12.0000000|2016-11-14 14:27:36.600 
668|1002|BE|EUR|12507|2016-09-02 11:57:12.0000000|2016-11-14 14:27:36.963

表2：

SelloutPricesAuditID|RequestID|SiteID|CountryCode|InsertedDateTime 
1|128|1002|BE|2016-11-14 16:55:29.543 
2|12507|1002|BE|2016-11-14 17:07:16.633

我這兩個表試圖按網站ID和COUNTRYCODE則僅獲得該組的最大請求ID。然後加入一起匹配的網站ID和國家代碼和最大請求ID。

如果左錶行不在右表中我希望它被返回。如果右表的請求ID不等於左表的maxRequestID，我希望該行返回。

這是我到目前爲止有：

SELECT s.*, spa2.* 
FROM [SPS_selloutprices].[SelloutPrices] as s WITH (NOLOCK) 

inner join (select sp.SiteID, sp.CountryCode, Max(sp.RequestID) as maxrequestid 
      from SPS_selloutprices.SelloutPrices sp 
      group by sp.SiteID, sp.CountryCode 
      ) s2 
      on s2.SiteID = s.SiteID and s.CountryCode = s2.CountryCode and s2.maxrequestid = s.RequestID 

full join (select spa.SiteID, spa.CountryCode, MAX(spa.RequestID) as maxrequestid 
      from sps_pricealerts.SelloutPricesAudit spa 
      group by spa.SiteID, spa.CountryCode 
      ) spa2 
      on s.SiteID = spa2.SiteID and s.CountryCode = spa2.CountryCode and s2.maxrequestid = spa2.maxrequestid

來源

2016-11-15 Toby Jackson

這是我想出了最終的答案，它的工作原理我怎麼想，如果你有辦法改進它，我想聽聽你的建議。

SELECT s.*, spa2.* 
FROM [SPS_selloutprices].[SelloutPrices] as s WITH (NOLOCK) 

inner join (select sp.SiteID, sp.CountryCode, Max(cast(sp.RequestID as int)) as maxrequestid 
      from SPS_selloutprices.SelloutPrices sp 
      group by sp.SiteID, sp.CountryCode 
      ) s2 
      on s2.SiteID = s.SiteID and s.CountryCode = s2.CountryCode and s2.maxrequestid = s.RequestID 

full join (select spa.SiteID, spa.CountryCode, spa.IsRetrieved, max(cast(spa.RequestID as int)) as maxrequestid 
      from sps_pricealerts.SelloutPricesAudit spa 
      group by spa.SiteID, spa.CountryCode, spa.IsRetrieved 
      ) spa2 
      on s.SiteID = spa2.SiteID and s.CountryCode = spa2.CountryCode and s2.maxrequestid = spa2.maxrequestid 
where ((s.RequestID <> spa2.maxrequestid or spa2.maxrequestid is null) 
or (spa2.IsRetrieved <> 1 or spa2.IsRetrieved is null)) 
and s.CountryCode = @countryCode

來源

2016-11-15 11:45:54

完整聯接返回只用右手記錄，然後s2.maxrequestid爲NULL - 這樣行不INNER JOIN回來並消失 - 如果這是一個問題 - 您可能需要檢查 – Cato

，試圖反映FULL OUTER JOIN使用 - 如果想的

 SELECT s.*, spa2.* 
    FROM [SPS_selloutprices].[SelloutPrices] as s 

    inner join (select sp.SiteID, sp.CountryCode, Max(sp.RequestID) as maxrequestid 
       from SPS_selloutprices.SelloutPrices sp 
       group by sp.SiteID, sp.CountryCode 
       ) s2 
       on s2.SiteID = s.SiteID and s.CountryCode = s2.CountryCode and s2.maxrequestid = s.RequestID 
        OR spa2.SiteID = s.SiteID and s.CountryCode = spa2.CountryCode and spa2.maxrequestid = s.RequestID 

    full join (select spa.SiteID, spa.CountryCode, MAX(spa.RequestID) as maxrequestid 
       from sps_pricealerts.SelloutPricesAudit spa 
       group by spa.SiteID, spa.CountryCode 
       ) spa2 
       on s.SiteID = spa2.SiteID and s.CountryCode = spa2.CountryCode and s2.maxrequestid = spa2.maxrequestid

來源

2016-11-15 11:53:32 Cato

SQL從一個組的兩個表中選擇最大ID

回答

相關問題