Hello, my name is Erik and I'm a Senior Analyst Programmer. To build more complex queries you must practice, practice and practice. Challenge yourself! Think of complex results you want in a report and do the query, however how long it will take. Over time, you'll become more efficient in building queries and you'll be able to analyse any data.

If you need help to get a step by step guideline to follow or want private SQL training, I'm available to help you.

Regards,

Erik