How To Fix SDDL_PARSER_MSG306 - LEFT OUTER TO MANY JOIN is not supported with WITH HIERARCHY

SAP Error Message - Details

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 306

• Message text: LEFT OUTER TO MANY JOIN is not supported with WITH HIERARCHY

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SDDL_PARSER_MSG306 - LEFT OUTER TO MANY JOIN is not supported with WITH HIERARCHY ?

  The SAP error message SDDL_PARSER_MSG306 indicates that there is an issue with the use of a LEFT OUTER JOIN in conjunction with a WITH HIERARCHY clause in your query. This error typically arises in the context of SAP BW (Business Warehouse) or SAP HANA when working with data models that involve hierarchies.
  Cause:
  The error occurs because the SQL syntax or the data model does not support the combination of a LEFT OUTER JOIN with a WITH HIERARCHY clause. In SAP BW or HANA, hierarchies are often used to represent parent-child relationships in a structured way, and certain types of joins may not be compatible with this structure.
  Solution:
  To resolve this error, you can consider the following approaches:
  
  
  Change the Join Type: If possible, modify the LEFT OUTER JOIN to an INNER JOIN. This may resolve the issue if the data model allows for it and if you do not need to include records from the left table that do not have matching records in the right table.
  
  
  Remove the WITH HIERARCHY Clause: If the hierarchy is not essential for your query, consider removing the WITH HIERARCHY clause. This will allow the LEFT OUTER JOIN to function without issues.
  
  
  Re-structure the Query: If you need both the LEFT OUTER JOIN and the hierarchy, consider restructuring your query. You might need to break it into multiple steps or use subqueries to achieve the desired results without violating the constraints of the SQL syntax.
  
  
  Check Data Model: Review the data model to ensure that it is designed correctly for the types of queries you are trying to run. Sometimes, the underlying data model may need adjustments to support the required operations.
  
  
  Consult Documentation: Refer to the SAP documentation for your specific version of BW or HANA. There may be specific guidelines or best practices for working with hierarchies and joins that can help you avoid this error.
  
  
  Related Information:
  
  SAP Notes and Knowledge Base Articles: Check SAP's support portal for any notes or articles related to this error message. There may be updates or patches that address this issue.
  Community Forums: Engage with the SAP community forums or user groups. Other users may have encountered similar issues and can provide insights or solutions.
  Performance Considerations: Be aware that using complex joins and hierarchies can impact query performance. Always test your queries for efficiency, especially in large datasets.
  
  By following these steps, you should be able to resolve the error and successfully execute your query.