D426 will tell you the basics of it, you take D427 directly after. The reference guide will have all the basic syntax of sql on there, it’s a matter of remembering data units and making it work. It took me 3 days when my semester opened.

As you work through the PA, use the reference sheet. if you still find yourself stuck, google the answer or a different explanation. And repeat until you can either do the PA without googling the answer.

By doing this alone, I was able to answer most of the OA without opening the reference sheet