Congratulations! You've just completed function management. It's time to quickly review what we've learned in this part:

• The CREATE FUNCTION statement is used to create a new function.
• The CREATE OR REPLACE FUNCTION command allows us to change the definition of a function. If the specified function doesn't exist, the command creates it. If the function exists, it is replaced.
• To rename a function, you can use the ALTER FUNCTION ... RENAME TO command.
• The DROP command with the IF EXISTS option can be used to remove a function that is no longer needed.

We hope you enjoyed this part and learned something new about function management. See you in the last part!