How To Fix RS_HCPR_MODEL086 - Inner join '&1' must not contain outer joins

SAP Error Message - Details

• Message type: E = Error

• Message class: RS_HCPR_MODEL - Messages related to the HANA Composite Provider Backend

• Message number: 086

• Message text: Inner join '&1' must not contain outer joins

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RS_HCPR_MODEL086 - Inner join '&1' must not contain outer joins ?

  The SAP error message RS_HCPR_MODEL086 indicates that there is an issue with the way joins are defined in a query or data model, specifically that an inner join is being used in conjunction with outer joins. In SQL, inner joins and outer joins serve different purposes, and mixing them inappropriately can lead to ambiguous results or errors.
  Cause:
  The error occurs when:
  
  An inner join is defined in a query that also includes outer joins (LEFT JOIN, RIGHT JOIN, or FULL OUTER JOIN).
  The query or data model is not structured correctly, leading to a conflict between the types of joins being used.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review the Query/Model: Check the SQL query or the data model where the error is occurring. Look for any inner joins that are being used alongside outer joins.
  
  
  Modify Joins:
  
  If you need to keep the outer joins, consider changing the inner join to an outer join if it makes sense for your data retrieval needs.
  Alternatively, if the inner join is necessary, you may need to restructure the query to separate the inner and outer joins into different parts of the query.
  
  
  
  Use Subqueries: If you need to combine results from inner and outer joins, consider using subqueries. You can perform the outer join in a subquery and then join the result with the inner join in the main query.
  
  
  Check Join Conditions: Ensure that the join conditions are correctly defined and that they logically make sense for the data you are working with.
  
  
  Test the Query: After making changes, test the query to ensure that it runs without errors and returns the expected results.
  
  
  Related Information:
  
  Join Types: Understanding the differences between inner joins and outer joins is crucial. An inner join returns only the rows that have matching values in both tables, while an outer join returns all rows from one table and the matched rows from the other table, filling in NULLs where there are no matches.
  SQL Best Practices: When designing queries, it's important to keep the logic clear and avoid mixing join types unless absolutely necessary. This helps maintain readability and reduces the likelihood of errors.
  SAP Documentation: Refer to SAP's official documentation or community forums for additional guidance on handling specific join scenarios in your version of SAP.
  
  By following these steps, you should be able to resolve the RS_HCPR_MODEL086 error and successfully execute your query or data model.