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A data analyst has created a user-defined function using the following line of code: CREATE FUNCTION price(spend DOUBLE, units DOUBLE) RETURNS DOUBLE RETURN spend / units; Which of the following code blocks can be used to apply this function to the customer_spend and customer_units columns of the table customer_summary to create column customer_price?
Correct Answer: E
A user-defined function (UDF) is a function defined by a user, allowing custom logic to be reused in the user environment1. To apply a UDF to a table, the syntax is SELECT udf_name(column_name) AS alias FROM table_name2. Therefore, option E is the correct way to use the UDF price to create a new column customer_price based on the existing columns customer_spend and customer_units from the table customer_summary. Reference: What are user-defined functions (UDFs)? User-defined scalar functions - SQL V
