Examples: UDF code

These examples show how to implement UDF code by using SQL functions and external functions.

• Example: Square of a number UDF
  In this example, suppose that you want a function that returns the square of a number.
• Example: Counter
  Suppose you want to number the rows in your SELECT statement. So you write a UDF which increments and returns a counter.
• Example: Weather table function
  This is an example table function that returns weather information for various cities in the United States.