How To Fix SDDL_PARSER_MSG308 - CROSS JOIN is not supported with WITH HIERARCHY clause

SAP Error Message - Details

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 308

• Message text: CROSS JOIN is not supported with WITH HIERARCHY clause

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SDDL_PARSER_MSG308 - CROSS JOIN is not supported with WITH HIERARCHY clause ?

  The SAP error message SDDL_PARSER_MSG308 indicates that there is an issue with the use of a CROSS JOIN in conjunction with the WITH HIERARCHY clause in a 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 used in the query is not supported. Specifically, the CROSS JOIN operation cannot be used when the WITH HIERARCHY clause is present. The WITH HIERARCHY clause is designed to work with hierarchical data structures, and combining it with a CROSS JOIN can lead to ambiguous results or performance issues.
  Solution:
  To resolve this error, you can consider the following approaches:
  
  
  Remove the CROSS JOIN: If possible, refactor your query to eliminate the CROSS JOIN. Instead, use appropriate JOINs (like INNER JOIN or LEFT JOIN) that are compatible with the WITH HIERARCHY clause.
  
  
  Reorganize the Query: If the logic of your query requires a cross join, you may need to rethink how you structure your query. Consider breaking it down into smaller parts or using subqueries that do not involve the WITH HIERARCHY clause.
  
  
  Use Alternative Methods: If you need to work with hierarchical data, explore other ways to achieve your goal without using a CROSS JOIN. This might involve using different types of joins or restructuring your data model.
  
  
  Check Documentation: Refer to the SAP documentation for the specific version you are using to understand the limitations and best practices when working with hierarchies and joins.
  
  
  Related Information:
  
  Hierarchical Data: In SAP BW and HANA, hierarchical data structures are often used to represent parent-child relationships. Understanding how to work with these structures is crucial for effective data modeling.
  SQL Syntax: Familiarize yourself with SQL syntax and the specific requirements for using joins and clauses in SAP HANA or BW.
  Performance Considerations: Be aware that using complex joins, especially with large datasets, can lead to performance issues. Always test your queries for efficiency.
  
  By following these steps, you should be able to resolve the error and successfully execute your query without encountering the SDDL_PARSER_MSG308 message.