How To Fix SDDL_PARSER_MSG090 - Use of Union and Union All in one view is too unspecific

SAP Error Message - Details

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 090

• Message text: Use of Union and Union All in one view is too unspecific

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SDDL_PARSER_MSG090 - Use of Union and Union All in one view is too unspecific ?

  The SAP error message SDDL_PARSER_MSG090 indicates that there is an issue with the use of both UNION and UNION ALL in a single view definition. This error typically arises when you are trying to create a view that combines multiple result sets using these two SQL operations in a way that is not allowed or is ambiguous.
  Cause:
  
  Ambiguous Use of UNION and UNION ALL: The error occurs when both UNION (which removes duplicate rows) and UNION ALL (which includes all rows, including duplicates) are used together in a way that the SQL parser cannot resolve the intent.
  Complexity in View Definition: The complexity of the SQL statement may lead to confusion in how the data is being combined, especially if the structure of the queries involved is not clear.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review the SQL Statement: Check the SQL view definition for the use of UNION and UNION ALL. Ensure that you are using one or the other consistently.
  
  
  Separate Views: If you need to combine results from different queries, consider creating separate views for each part and then combining those views in a final view, rather than mixing UNION and UNION ALL in a single view.
  
  
  Simplify the Query: If possible, simplify the SQL query to avoid the need for both UNION and UNION ALL. This may involve restructuring the logic of how data is being retrieved.
  
  
  Use Subqueries: If you need to maintain both operations, consider using subqueries to handle the logic separately before combining the results.
  
  
  Testing: After making changes, test the view to ensure that it behaves as expected and does not produce the error.
  
  
  Related Information:
  
  SQL UNION vs. UNION ALL: Understanding the difference between these two operations is crucial. UNION removes duplicates, while UNION ALL retains all records, including duplicates. Choose the appropriate one based on your data requirements.
  Performance Considerations: Using UNION ALL can be more performant than UNION because it does not require the database to check for duplicates.
  SAP Documentation: Refer to SAP's official documentation for more details on SQL view definitions and best practices.
  
  By following these steps, you should be able to resolve the error and create a valid view in SAP.