Question

Which command creates a user-defined schema function?

A. ALTER MODULE PUBLISH FUNCTION
B. TRANSLATE FUNCTION
C. ALTER MODULE ADD FUNCTION
D. CREATE FUNCTION

Answer 1

The command to create a user-defined schema function is D. CREATE FUNCTION. This command is essential for defining new functions within a database and specifies the function name, parameters, return type, and the function logic.

Step-by-step explanation:

The command to create a user-defined schema function in SQL is D. CREATE FUNCTION. This command is used to define a new function within the database. The syntax for creating a function can vary depending on the database system (e.g., Microsoft SQL Server, PostgreSQL, Oracle), but it typically includes the function name, parameters, return type, and the body of the function where the operations of the function are defined.

When you define a function using the CREATE FUNCTION command, you can specify the desired schema where the function should reside if you do not want it to be in the default schema. Here's a simplified example of the command:

CREATE FUNCTION schema_name.function_name (parameters)
RETURNS return_datatype AS
BEGIN
-- Function logic goes here
END;