Summary
In this lesson, you learned the principles of user-definable functions: why you might need them and how to install them.
You saw how to configure your MySQL installation so that it can load user-definable functions. You compiled the sample UDFs included in your MySQL installation, and activated and tested them in the mysql console.
You also learned how to write your own UDFs in C or C++, studying the calling sequences that should be used.
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