What is one way to define a procedure using SQL in SAP HANA?

The use of the CREATE PROCEDURE statement is the correct approach to define a procedure in SAP HANA. This method is specifically designed for creating stored procedures, allowing developers to encapsulate logic that can be reused across applications. The CREATE PROCEDURE statement includes the ability to define input and output parameters, specify the procedure logic, and set data security options that can enforce access controls for different user roles or system contexts.

Defining a procedure using the CREATE PROCEDURE statement provides flexibility in how the procedure operates and interacts with the database environment. Additionally, incorporating data security settings is crucial, as it ensures that only authorized users can execute or access the procedure, thereby protecting sensitive data and maintaining data integrity.

The other methods mentioned are not suitable for defining a procedure. For example, while the CREATE FUNCTION statement is similar, it is meant for creating functions that return a single value and are not executed like procedures. Using direct SQL lacks the structured approach needed for procedures, and defining a procedure as READ-ONLY is a specific modification of function characteristics, not a requirement for all procedures. Thus, using the CREATE PROCEDURE statement with the appropriate data security settings is the most accurate and recommended practice.