Sql 使用或插入内部联接子句

我有一个动态查询，其中声明了3个不同的变量，如：

       DECLARE @JobNoteQuery NVARCHAR(MAX) = IIF(@JobNote = '%' , '' , ' INNER JOIN (SELECT ParentGuid FROM JobNotes JN WITH (NOLOCK) 
                            WHERE JN.Note LIKE ''%''+@JobNote+ ''%''
                            GROUP BY ParentGuid) JN ON P.ProjectGuid = JN.ParentGuid');

       DECLARE @ContactQuery NVARCHAR(MAX) = IIF(@Contact = '%' , '' , ' LEFT JOIN(SELECT
                        [ProjectKey]
                        FROM [ProjectCustomerContact] AS [pcc]
                            LEFT JOIN [Contact] AS [c] ON [c].[ContactKey] = [pcc].[ContactKey]
                        WHERE [c].[LastName] LIKE ''%''+@LastName+''%'') AS [pcc] ON [pcc].[ProjectKey] = [p].[ProjectKey]')

       DECLARE @CustomerQuery NVARCHAR(MAX) = IIF(@Customer = '%' , '' , 'LEFT JOIN(SELECT
                        [ProjectKey]
                        FROM [ProjectCustomer] AS [pc]
                            LEFT JOIN [Customer] AS [c] ON [c].[CustomerKey] = [pc].[CustomerKey]
                        WHERE([c].[Name] LIKE ''%''+@CustName+''%''
                            OR [c].[DBA] LIKE ''%''+@CustName+''%'')) AS [PC] ON [pc].[ProjectKey] = [p].[ProjectKey]')

所以在select查询中，我使用变量into JOIN子句，如：

  ...INNER JOIN [Region] AS [re] ON [a].[RegionKey] = [re].[RegionKey]
                          '+@JobNoteQuery+'
                          '+@ContactQuery+'
                          '+@CustomerQuery+'
                       WHERE...

我的问题是。如果我的树参数返回它们的值，我的意思是@JobNoteQuery、@ContactQuery和@CustomerQuery，总是返回内部联接和左联接，但如果其中一个没有值，则该值可以为null，它只会返回空列表，所以有没有办法在内部联接中使用OR子句？比如：

---

那不可能？将数据插入临时表，然后您可以开始使用提供的具有相同列数据类型的联合，只需获得3个查询中每个查询的俱乐部结果集。或者您在临时表中有数据，将所需的连接条件保留下来，或者内部连接在此时将是一件小事。

除非您使用动态SQL，否则这是不可能的。

 ...INNER JOIN [Region] AS [re] ON [a].[RegionKey] = [re].[RegionKey]
          OR
                              '+@JobNoteQuery+'
          OR
                              '+@ContactQuery+'
          OR
                              '+@CustomerQuery+'
                           WHERE...