Java 保留详细的行是什么意思？当您执行常规聚合函数时，它会汇总（即相加，得到平均值）所有行数据。返回的唯一值是groupby中指定的字段和聚合。使用窗口功能，您可以执行类似的操作，但您可以保留所有详细数据（即GROUP BY中未指定的附加列），这将如何返回？这是

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保留详细的行是什么意思？当您执行常规聚合函数时，它会汇总（即相加，得到平均值）所有行数据。返回的唯一值是

groupby

中指定的字段和聚合。使用窗口功能，您可以执行类似的操作，但您可以保留所有详细数据（即

GROUP BY

中未指定的附加列），这将如何返回？这是否会返回一个olis集合？目前，我正在通过放置json.put（“fieldname”，resultset.get（“queryfieldname”）；创建一个json；这将如何返回？这将返回一个OLI集合吗？目前，我正在通过放置json.put（“fieldname”，resultset.get（“queryfieldname”）创建一个json；不幸的是，数据类型并不重要。我们只通过代码创建订单项目，所以如果订单项目已经创建，我只需要验证1是否存在，我甚至不需要检查它是否正确，只需要它是否存在。如果1存在，则它们已经创建，如果不存在，则我需要创建它们。我添加了我的第三个场景o在您留下评论的同时。我不确定它现在是否适用。等等！您是专门寻找没有orderitems的订单吗？不幸的是，数据类型无关紧要。我们仅通过代码创建订单项，因此如果订单项已创建，我只需验证1是否存在，甚至不需要检查I如果它是正确的，只是它存在..如果1存在，那么它们已经被创建，如果不存在，那么我需要创建它们。我在您留下评论的同时添加了我的第三个场景。我不确定它现在是否适用。等等！您是专门寻找没有orderitems的订单吗？

SELECT 
 ord.ID AS ord_id,
 oli.sfid AS oli_sfid,
 ord.HasMSISDN__c AS ord_HasMSISDN__c,
 ord.dealer_code__c AS ord_dealer_code__c, 
 ord.recordtypeid AS ord_recordtypeid,
 ord.order_number__c AS ord_order_number__c,
 ord.status AS ord_status,
 ord.opportunityid AS ord_opportunityid,
 ord.sfid AS ord_sfid,
 ord.cancelled_by__c AS ord_cancelled_by__c,
 ord.cancelled_on__c AS ord_cancelled_on__c,
 ord.created_by__c AS ord_created_by__c,
 ord.created_on__c AS ord_created_on__c,
 ord.docusign_email_address__c AS ord_docusign_email_address__c,
 ord.esignature_resent_to__c AS ord_esignature_resent_to__c, 
 ord.esignature_resent_by__c AS ord_esignature_resent_by__c,
 ord.esignature_resent_on__c AS ord_esignature_resent_on__c, 
 ord.pricebook2id AS ord_pricebook2id,
 cont.opportunity__c AS cont_opportunity__c,
 cont.sfid AS cont_sfid,
 opp.isclosed AS opp_isclosed,
 opp.sfid AS opp_sfid,
 opp.recordtypeid AS opp_recordtypeid,
 opp.pricebook2id AS opp_pricebook2id, 
 accban.sfid AS accban_sfid, 
 accban.ban__c AS accban_ban__c,
 usr.sfid AS usr_sfid  
 FROM fullsbxsalesforce.order ord
 LEFT JOIN fullsbxsalesforce.contract cont ON ord.contractid = cont.sfid
 LEFT JOIN fullsbxsalesforce.opportunity opp ON cont.opportunity__c = opp.sfid
 LEFT JOIN fullsbxsalesforce.user usr ON (ord.dealer_code__c = usr.dealer_code_bd__c OR ord.dealer_code__c = usr.Dealer_Code_Co_Sell__c OR ord.dealer_code__c = usr.Rep_Dealer_Code__c OR ord.dealer_code__c = usr.dealer_code_secondary__c) LEFT JOIN fullsbxsalesforce.account_ban_tax_id__c accban ON ord.ban_number__c = accban.ban__c 
 LEFT JOIN fullsbxsalesforce.orderitem oli ON ord.sfid = oli.orderid 
 WHERE ord.sfid = 'SPECIFIC ID'

, (select * from fullsbxsalesforce.orderitem WHERE ord.sfid = orderid limit 1) oli

SELECT ...
FROM (
  -- Your initial query with new field added
  SELECT ...
  ROW_NUMBER() OVER(PARTITION BY OLI_field_name ORDER BY <ordering_clause>) AS RowRank
  FROM ...
) src
WHERE RowRank = 1

SELECT *
FROM (
  SELECT 
   ord.ID AS ord_id,
   oli.sfid AS oli_sfid,
   ord.HasMSISDN__c AS ord_HasMSISDN__c,
   ord.dealer_code__c AS ord_dealer_code__c, 
   ord.recordtypeid AS ord_recordtypeid,
   ord.order_number__c AS ord_order_number__c,
   ord.status AS ord_status,
   ord.opportunityid AS ord_opportunityid,
   ord.sfid AS ord_sfid,
   ord.cancelled_by__c AS ord_cancelled_by__c,
   ord.cancelled_on__c AS ord_cancelled_on__c,
   ord.created_by__c AS ord_created_by__c,
   ord.created_on__c AS ord_created_on__c,
   ord.docusign_email_address__c AS ord_docusign_email_address__c,
   ord.esignature_resent_to__c AS ord_esignature_resent_to__c, 
   ord.esignature_resent_by__c AS ord_esignature_resent_by__c,
   ord.esignature_resent_on__c AS ord_esignature_resent_on__c, 
   ord.pricebook2id AS ord_pricebook2id,
   cont.opportunity__c AS cont_opportunity__c,
   cont.sfid AS cont_sfid,
   opp.isclosed AS opp_isclosed,
   opp.sfid AS opp_sfid,
   opp.recordtypeid AS opp_recordtypeid,
   opp.pricebook2id AS opp_pricebook2id, 
   accban.sfid AS accban_sfid, 
   accban.ban__c AS accban_ban__c,
   usr.sfid AS usr_sfid,
   ROW_NUMBER() OVER(PARTITION BY oli.sfid ORDER BY <order_col>) AS RowRank -- Assigns a rank to each row with the same oli.sfid value
  FROM fullsbxsalesforce.order ord
  LEFT JOIN fullsbxsalesforce.contract cont ON ord.contractid = cont.sfid
  LEFT JOIN fullsbxsalesforce.opportunity opp ON cont.opportunity__c = opp.sfid
  LEFT JOIN fullsbxsalesforce.user usr ON (ord.dealer_code__c = usr.dealer_code_bd__c OR ord.dealer_code__c = usr.Dealer_Code_Co_Sell__c OR ord.dealer_code__c = usr.Rep_Dealer_Code__c OR ord.dealer_code__c = usr.dealer_code_secondary__c)
  LEFT JOIN fullsbxsalesforce.account_ban_tax_id__c accban ON ord.ban_number__c = accban.ban__c 
  LEFT JOIN fullsbxsalesforce.orderitem oli ON ord.sfid = oli.orderid 
  WHERE ord.sfid = 'SPECIFIC ID'
) src
WHERE RowRank = 1 -- Only get one row per oli.sfid value

SELECT ord.ID AS ord_id,
       count(*) AS oli_count,
       ord.HasMSISDN__c AS ord_HasMSISDN__c,
       ...
       accban.ban__c AS accban_ban__c,
       usr.sfid AS usr_sfid  
FROM   order ord
       ...
       LEFT JOIN orderitem oli ON ord.sfid = oli.orderid 
WHERE  ord.sfid = 'SPECIFIC ID'
GROUP BY
       ord.ID,
       ord.HasMSISDN__c,
       ...
       accban.ban__c,
       usr.sfid

SELECT ord.ID AS ord_id,
       ...
       oli.sfid AS oli_sfid,
       usr.sfid AS usr_sfid  
FROM   fullsbxsalesforce.order ord
       INNER JOIN orderitem oli ON ord.sfid = oli.orderid 
       LEFT JOIN contract cont ON ord.contractid = cont.sfid
       LEFT JOIN opportunity opp ON cont.opportunity__c = opp.sfid
       LEFT JOIN user usr ON ord.dealer_code__c = usr.dealer_code_bd__c 
                             OR ord.dealer_code__c = usr.Dealer_Code_Co_Sell__c 
                             OR ord.dealer_code__c = usr.Rep_Dealer_Code__c 
                             OR ord.dealer_code__c = usr.dealer_code_secondary__c
       LEFT JOIN account_ban_tax_id__c accban ON ord.ban_number__c = accban.ban__c 
 WHERE ord.sfid = 'SPECIFIC ID'