Which system variable contains 0 to indicate that no data was found while reading a database table?

The system variable that contains 0 to indicate that no data was found while reading a database table is SY-SUBRC. This variable is used in ABAP to hold the return code of various operations, including database access. In terms of database operations, a value of 0 typically indicates that the operation was successful and data was retrieved. Conversely, a value other than 0 indicates different types of issues, including the possibility that no data matching the query was found.

This characteristic of SY-SUBRC is essential for error handling and flow control within ABAP programs since developers often check this variable after executing SQL statements to determine the success of their operations and to decide how to proceed accordingly. Thus, understanding the role of SY-SUBRC is crucial for effective ABAP programming.