如何根据表在列中出现的次数动态地进行内部联接？

如何解决如何根据表在列中出现的次数动态地进行内部联接？

所以基本上我想填充表 Table1

中提到的表的名为 Mjolnir_Source_ID 的列

TABLE1 = #VerticalTableList

VerticalTableName           VerticalColumnName
Enrollment                     NULL
GradeMaster                    NULL

TABLE2 = Reference.dbo.PrepopulateExceptions

TableName         ColumnName         ReferenceTableName      ReferenceColumnName
GradeMaster        Grade               NULL                       NULL
GradeMaster        CatalogID           ACGradeCatalog             ID
Enrollment         Name                NULL                       NULL
Enrollment         EnrollmentID        ACEnrollmentMode           ID
Enrollment         AcademicLevelID     AcademicLevel              ID
Enrollment         CatalogID           ACGradeCatalog             ID  

在Table2的ReferenceTableName列中提到的所有ReferenceTables都有Mjolnir_SourceID列，我想为每个VerticalTableName Table合并所有参考表的Mjolnir列。

通过基于ColumnName和ReferenceColumnName列对每个VerticalTable及其ReferenceTable进行内部联接，可以获取每个引用表的Mjolnir_SourceID。

现在，如果任何VerticalTable的ReferenceTableName和ReferenceColumnName列为空，那么我们将使用ColumnName作为concat的输入。

SELECT @sqlStr = 'UPDATE a' + char(13) + char(10) + ' SET a.Mjolnir_Source_ID = CASE WHEN ' +
          ' b.ReferenceTableName IS NULL AND b.ReferenceColumnName IS NULL THEN CONCAT('+ 
           VerticalTableName +'.' + 'b.ColumnName,c.Mjolnir_Source_ID)
          ELSE CONCAT(b.Mjolnir_Source_ID,c.Mjolnir_Source_ID) '
          + char(13) + char(10) + '  FROM ' + VerticalTableName + ' a' + char(13) + char(10) 
          + ' INNER JOIN ' + 'Reference.dbo.PrepopulateExceptions b'
          + '   ON b.VerticalTable = ' + VerticalTableName +
          + ' INNER JOIN b.ReferenceTableName c ON c.ReferenceColumnName = b.ColumnName '
          FROM #VerticalTableList

上述查询中对表 GradeMaster 的结果查询应如下所示

UPDATE a
SET a.Mjolnir_Source_ID = CONCAT(a.Grade,c.Mjolnir_Source_ID)
FROM GradeMaster a
INNER JOIN Reference.dbo.PrepopulateExceptions b   
ON b.VerticalTable = GradeMaster 
INNER JOIN b.ACGradeCatalog c ON 
c.ID = b.CatalogID

对于表注册，结果查询应为此；

UPDATE a
SET a.Mjolnir_Source_ID = CONCAT(a.Name,c.Mjolnir_Source_ID,d.Mjolnir_Source_ID,e.Mjolnir_Source_ID)
FROM Enrollment a
INNER JOIN Reference.dbo.PrepopulateExceptions b   
ON b.VerticalTable = Enrollment 

INNER JOIN b.ACEnrollmentMode c ON 
c.ID = b.EnrollmentID

INNER JOIN b.AcademicLevel d ON 
d.ID = b.AcademicLevelID

INNER JOIN b.ACGradeCatalog e ON
e.ID = b.CatalogID

有人可以在这里帮助我吗？