How To Fix DDLS177 - CASE for column &: the resulting column is type (&,&,&)

SAP Error Message - Details

• Message type: E = Error

• Message class: DDLS - For DDL source handling

• Message number: 177

• Message text: CASE for column &: the resulting column is type (&,&,&)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DDLS177 - CASE for column &: the resulting column is type (&,&,&) ?

  The SAP error message DDLS177 typically occurs during the process of defining or modifying a database table or view in the Data Dictionary (DDLS) when there is a mismatch in the data types of the columns involved in a CASE statement. The error message indicates that the resulting column type is not consistent across all branches of the CASE statement.
  Cause:
  The error arises when the CASE statement in your SQL or ABAP code has branches that return different data types. For example, if one branch returns an integer and another returns a string, the resulting type cannot be determined, leading to this error.
  Solution:
  To resolve the DDLS177 error, you need to ensure that all branches of the CASE statement return values of the same data type. Here are some steps you can take:
  
  
  Check Data Types: Review the data types of the expressions in each branch of the CASE statement. Ensure they are compatible.
  
  
  Type Casting: If the branches return different types, you can use type casting to convert them to a common type. For example, if you have a numeric and a string, you might convert the numeric to a string or vice versa.
  Example:
  CASE 
      WHEN condition1 THEN CAST(value1 AS VARCHAR)
      WHEN condition2 THEN CAST(value2 AS VARCHAR)
      ELSE 'default_value'
  END AS result_column
  
  
  Use a Common Type: If possible, modify the CASE statement to ensure that all branches return a value of the same type. This might involve changing the logic or the values being returned.
  
  
  Review the Logic: Sometimes, the logic of the CASE statement may need to be revisited to ensure that it aligns with the intended data types.
  
  
  Related Information:
  
  Data Dictionary (DDLS): The Data Dictionary in SAP is a central repository that contains metadata about the data structures in the system, including tables, views, and data elements.
  SQL Syntax: Familiarize yourself with SQL syntax and data types in SAP to avoid similar issues in the future.
  ABAP Development: If you are working in ABAP, ensure that you are aware of the data types used in your program and how they interact with database operations.
  
  By ensuring that all branches of your CASE statement return the same data type, you should be able to resolve the DDLS177 error.