Question

我需要能够计算辅助表tblOptyRecordsHistorical中与主表tblOptyRecordsCurrent相关的记录数。

表格完全相同，主要包含当前的“每日快照”，辅助表包含以前的每日快照。

我有许多使用以下基本语法的标志：

(SELECT COUNT(OpportunityRecordID) AS Expr1
FROM dbo.tblOptyRecordsHistorical AS hist
WHERE (OpportunityGlobalCRMId = curr.OpportunityGlobalCRMId)) 
AS prevEntries,

这很好用。但是有一个标志，我需要计算历史表中的记录数，但逻辑更复杂，取决于主表中的值：

SELECT OpportunityGlobalCRMId, 
(SELECT SUM(CASE WHEN curr.PartnerGlobalCRMID IS NULL THEN CASE WHEN
hist.IgnoreOpportunity != 0 THEN 1 ELSE 0 END ELSE CASE 
WHEN curr.CustomerAccountID IS NULL THEN CASE WHEN hist.IgnoreOpportunity = 1 AND 
hist.PartnerGlobalCRMID = curr.PartnerGlobalCRMID THEN 1 ELSE 0 END ELSE CASE WHEN
hist.IgnoreOpportunity = 1 AND CONVERT(varchar, hist.CustomerAccountID) + 
hist.PartnerGlobalCRMID = CONVERT(varchar, curr.CustomerAccountID) + 
curr.PartnerGlobalCRMID AND hist.OpptyIncentiveCreatedDate = 
curr.OpptyIncentiveCreatedDate THEN 1 ELSE 0 END END END) AS Expr1 FROM 
dbo.tblOptyRecordsHistorical AS hist WHERE (OpportunityGlobalCRMId = 
curr.OpportunityGlobalCRMId)) AS prevIgnored
FROM dbo.tblOptyRecordsCurrent AS curr

除了最初的OpportunityGlobalCRMID之外，我省略了其他标志和字段。这会导致以下错误：Multiple columns are specified in an aggregated expression containing an outer reference. If an expression is being aggregated contains an outer reference, then that outer reference must be the only column referenced in the expression.

Answer 1

SQL Server不喜欢在聚合子查询表达式中混合使用内部（hist表）和外部（curr表）。有一些解释here。

建议的解决方案是在子查询中重新包含外部表，加入它的键，以使所有引用成为内部。在您的情况下，这意味着将tblOptyRecordsCurrent表放在子查询中，如下所示：

SELECT OpportunityGlobalCRMId, 
    (SELECT SUM(CASE 
                WHEN curr2.PartnerGlobalCRMID IS NULL 
                THEN CASE WHEN hist.IgnoreOpportunity != 0 THEN 1 ELSE 0 END 
                ELSE CASE 
                        WHEN curr2.CustomerAccountID IS NULL 
                        THEN CASE 
                            WHEN hist.IgnoreOpportunity = 1 AND hist.PartnerGlobalCRMID = curr2.PartnerGlobalCRMID THEN 1 ELSE 0 END 
                        ELSE CASE 
                            WHEN hist.IgnoreOpportunity = 1 
                                AND CONVERT(varchar, hist.CustomerAccountID) + hist.PartnerGlobalCRMID 
                                    = CONVERT(varchar, curr2.CustomerAccountID) + curr2.PartnerGlobalCRMID 
                                AND hist.OpptyIncentiveCreatedDate = curr2.OpptyIncentiveCreatedDate 
                            THEN 1 
                            ELSE 0 
                            END 
                    END 
            END) AS Expr1 
    FROM dbo.tblOptyRecordsHistorical AS hist 
        inner join dbo.tblOptyRecordsCurrent AS curr2 on curr2.OpportunityGlobalCRMId = hist.OpportunityGlobalCRMId
    WHERE curr2.OpportunityGlobalCRMId = curr.OpportunityGlobalCRMId) AS prevIgnored
FROM dbo.tblOptyRecordsCurrent AS curr

但是没有测试过代码。

基于复杂标准计算辅助表中记录的问题

1 个答案: