How To Fix DDLS152 - Select * and joins cannot be combined

SAP Error Message - Details

• Message type: E = Error

• Message class: DDLS - For DDL source handling

• Message number: 152

• Message text: Select * and joins cannot be combined

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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Smart SAP Assistant

• What is the cause and solution for SAP error message DDLS152 - Select * and joins cannot be combined ?

  The SAP error message DDLS152 indicates that there is an issue with a SQL statement where a SELECT * is being combined with a JOIN operation. This is not allowed in certain contexts within SAP's database layer, particularly when using the Data Definition Language (DDL) or when working with certain database systems that SAP supports.
  Cause:
  The error occurs because the SQL syntax used is not compliant with the rules of the database or the specific SQL dialect that SAP is using. Specifically, the use of SELECT * (which selects all columns from a table) in conjunction with a JOIN operation can lead to ambiguity or inefficiencies, which is why it is restricted.
  Solution:
  To resolve this error, you should modify your SQL query to explicitly specify the columns you want to select instead of using SELECT *. Here’s how you can do it:
  
  
  Identify the Tables and Columns: Determine which tables you are joining and which specific columns you need from each table.
  
  
  Rewrite the Query: Instead of using SELECT *, write a query that explicitly lists the columns you want to retrieve. For example:
  SELECT a.column1, a.column2, b.column3
  FROM table_a a
  JOIN table_b b ON a.id = b.a_id
  
  
  Test the Query: After rewriting the query, test it to ensure it runs without errors and returns the expected results.
  
  
  Related Information:
  
  
  Performance Considerations: Using SELECT * can lead to performance issues, especially if the tables have many columns or if you are working with large datasets. Specifying only the necessary columns can improve performance and reduce the amount of data transferred.
  
  
  Database Compatibility: Different databases may have different rules regarding SQL syntax. Always refer to the documentation for the specific database you are working with to understand its limitations and best practices.
  
  
  SAP Documentation: For more detailed information, you can refer to SAP's official documentation or community forums where similar issues may have been discussed.
  
  
  By following these steps, you should be able to resolve the DDLS152 error and improve the quality of your SQL queries in SAP.