Over time I have found that the SQL skill
levels of most business users fall into
three categories: Novice, Analyst, and PowerUser.
To advance to the next level, you need to become familiar with the
"Breakthrough Skills" that define
boundaries between levels.
For more info, read my post:
Breakthrough SQL Skills
My courses focus on the most important
SQL skills you need so you can move to the next level:
For details, click on a course. Or check out the
Course Docs home.