SQL was frustrating to me when I did not know it very well. Taking the time to learn SQL (especially analytical flavored queries) and relational algebra changed

SQL was frustrating to me when I did not know it very well. Taking the time to learn SQL (especially analytical flavored queries) and relational algebra changed not just how I write software, but how I analyze other developers. RA is one of those can't-be-unseen tools that I think everyone either learns directly or spends effort/years doing poorly.