Welcome to another very important and interesting section!
One of the most basic things you can do with your data is applying filters, so that you get only the data you really want to get.
And another very basic thing you will want to do is to get your data in some specific order.
These filtering and sorting operations are in general very simple, but there are some basic things you need to learn if you want to do it correctly, and that is what you will learn in this section.
Have you heard about the term “NULL”? You will learn everything you need to know about NULLs in this section as well.
We have quite a few things to cover here, so we better start right away.
See you in the first lesson!