How To Fix DDLS326 - select * cannot be combined with 'group by'

SAP Error Message - Details

• Message type: E = Error

• Message class: DDLS - For DDL source handling

• Message number: 326

• Message text: select * cannot be combined with 'group by'

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.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message DDLS326 - select * cannot be combined with 'group by' ?

  The SAP error message DDLS326 indicates that there is an issue with a SQL query that attempts to use SELECT * in combination with a GROUP BY clause. In SQL, when you use GROUP BY, you need to specify the columns that you want to aggregate or group by, and using SELECT * is not allowed because it does not specify how to handle the other columns that are not included in the GROUP BY clause.
  Cause
  The error occurs because:
  
  The SQL statement is trying to select all columns (SELECT *) while also grouping the results by one or more columns.
  SQL requires that all columns in the SELECT list must either be included in the GROUP BY clause or be used in an aggregate function (like SUM, COUNT, AVG, etc.).
  
  Solution
  To resolve this error, you need to modify your SQL query. Here are the steps you can take:
  
  
  Specify Columns: Instead of using SELECT *, explicitly list the columns you want to retrieve. Ensure that all non-aggregated columns are included in the GROUP BY clause.
  For example, if your original query looks like this:
  SELECT * FROM your_table GROUP BY column1;
  You should change it to:
  SELECT column1, COUNT(column2) AS count_column2 FROM your_table GROUP BY column1;
  
  
  Use Aggregate Functions: If you need to include additional columns that are not part of the GROUP BY, you should apply aggregate functions to those columns.
  
  
  Review SQL Logic: Ensure that the logic of your query aligns with your intended results. Sometimes, restructuring the query or using subqueries can help achieve the desired outcome.
  
  
  Related Information
  
  SQL Standards: This behavior is consistent with SQL standards, which require that any column in the SELECT clause that is not part of an aggregate function must be included in the GROUP BY clause.
  Performance Considerations: Using SELECT * can lead to performance issues, especially if the table has many columns or if you are working with large datasets. It's generally a good practice to specify only the columns you need.
  Testing Queries: When developing SQL queries, consider testing them in a development environment to catch such errors before deploying them in production.
  
  By following these guidelines, you should be able to resolve the DDLS326 error and create valid SQL queries that work with GROUP BY.