How To Fix DDLS198 - Function & requires an alias for the column

SAP Error Message - Details

• Message type: E = Error

• Message class: DDLS - For DDL source handling

• Message number: 198

• Message text: Function & requires an alias for the column

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DDLS198 - Function & requires an alias for the column ?

  The SAP error message DDLS198, which states "Function & requires an alias for the column," typically occurs in the context of SQL queries or database views when a function is used in a SELECT statement without providing an alias for the resulting column. This is particularly relevant in ABAP Dictionary or when working with database views in SAP.
  Cause:
  The error arises when:
  
  A function (like an aggregate function or a scalar function) is used in a SELECT statement.
  The result of that function does not have an alias specified, which is required for the database to understand how to reference the resulting column.
  
  Solution:
  To resolve this error, you need to provide an alias for the column that results from the function. Here’s how you can do it:
  
  
  Identify the Function: Locate the function in your SQL query or view definition that is causing the error.
  
  
  Add an Alias: Modify the SQL statement to include an alias for the column. The syntax generally looks like this:
  SELECT FUNCTION_NAME(column_name) AS alias_name
  FROM table_name;
  For example, if you are using a function like SUM():
  SELECT SUM(sales) AS total_sales
  FROM sales_table;
  
  
  Check for Other Functions: If there are multiple functions in your query, ensure that each one has a corresponding alias.
  
  
  Related Information:
  
  SQL Standards: Providing aliases for derived columns is a common practice in SQL to improve readability and maintainability of queries.
  ABAP Dictionary: If you are working within the ABAP Dictionary, ensure that any views or database objects you create follow this convention.
  Testing: After making the changes, test the query or view to ensure that it executes without errors.
  
  Example:
  Here’s a simple example that illustrates the error and the solution:
  Error Example:
  SELECT SUM(sales)
  FROM sales_table;
  This will trigger the DDLS198 error because SUM(sales) does not have an alias.
  Corrected Example:
  SELECT SUM(sales) AS total_sales
  FROM sales_table;
  Now, the query should execute without errors, and you can reference the resulting column as total_sales.
  By following these steps, you should be able to resolve the DDLS198 error in your SAP environment.