How To Fix SDDL_PARSER_MSG281 - $$projection not permitted in group by clause

SAP Error Message - Details

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 281

• Message text: $$projection not permitted in group by clause

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SDDL_PARSER_MSG281 - $$projection not permitted in group by clause ?

  The SAP error message SDDL_PARSER_MSG281 with the description $$projection not permitted in group by clause typically occurs in the context of SAP HANA or when working with SQL queries in SAP systems. This error indicates that there is an issue with the way the GROUP BY clause is being used in your SQL query, particularly with respect to the projections (or selected columns) that are included.
  Cause:
  The error arises when you attempt to use a projection (a column or expression) in the GROUP BY clause that is not allowed. This can happen for several reasons:
  
  Invalid Columns: You may be trying to group by a column that is not part of the selected columns or is not an aggregate function.
  Complex Expressions: If you are using complex expressions or functions in the GROUP BY clause that are not supported.
  SQL Syntax: There may be a syntax error in your SQL query that is causing the parser to misinterpret your GROUP BY clause.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check the GROUP BY Clause: Ensure that all columns in the GROUP BY clause are either:
  
  Included in the SELECT statement.
  Aggregate functions (like SUM(), COUNT(), etc.) are used correctly.
  
  
  
  Simplify Expressions: If you are using complex expressions in the GROUP BY clause, try simplifying them or using the base columns instead.
  
  
  Review SQL Syntax: Double-check the entire SQL query for any syntax errors. Ensure that the GROUP BY clause is correctly formed.
  
  
  Use Aliases: If you are using column aliases in the SELECT statement, make sure to use the original column names in the GROUP BY clause, as some SQL dialects do not allow aliases in GROUP BY.
  
  
  Consult Documentation: Refer to the SAP HANA SQL Reference or the specific documentation for your SAP system to understand the limitations and rules regarding the GROUP BY clause.
  
  
  Example:
  Here’s a simple example to illustrate the correct usage:
  SELECT department, COUNT(employee_id) AS employee_count
  FROM employees
  GROUP BY department;
  In this example, department is included in the SELECT statement and is also used in the GROUP BY clause, which is correct.
  Related Information:
  
  SAP HANA SQL Reference: For detailed information on SQL syntax and functions.
  SAP Community: You can search for similar issues or ask questions in the SAP Community forums.
  Debugging Tools: Use SQL debugging tools available in your SAP environment to analyze the query execution plan and identify issues.
  
  By following these guidelines, you should be able to resolve the SDDL_PARSER_MSG281 error and successfully execute your SQL query.