Explanation:
The correct syntax for creating a user-defined function (UDF) in SQL involves using the CREATE FUNCTION statement, followed by the function name and parameters. It's essential to specify the return type with RETURNS STRING and to use the RETURN keyword to define the function's output based on the input conditions. The correct code snippet includes all these elements and properly uses the CASE statement for conditional logic. Other options either incorrectly use CREATE UDF instead of CREATE FUNCTION, omit necessary syntax like RETURNS STRING, or misuse the RETURN keyword.
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To efficiently apply custom logic on a string column named 'city' in the 'location' table, a data engineer decides to create a SQL user-defined function (UDF). Which of the following code snippets correctly defines this SQL UDF?
A
CREATE UDF combine_california (city STRING)RETURN CASE WHEN city = “San Francisco“ THEN “California“ ELSE cityEND;
B
CREATE FUNCTION combine_california (city STRING)RETURNS STRINGCASE WHEN city = “San Francisco“ THEN “California“ ELSE cityEND;
C
CREATE FUNCTION combine_california (city STRING)RETURNS STRINGRETURN CASE WHEN city = “San Francisco“ THEN “California“ ELSE cityEND;
D
CREATE FUNCTION combine_california (city STRING)RETURN CASE WHEN city = “San Francisco“ THEN “California“ ELSE cityEND;
E
CREATE UDF combine_california (city STRING)RETURN CASE WHEN city = “San Francisco“ THEN “California“ ELSE cityEND;
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