We are in a constant state of learning new knowledge, but also a process of constantly forgotten, we always learned then forget, how to solve this problem, the answer is to have a good memory method, our PostgreSQL-Essentials study materials will do well on this point. Our PostgreSQL-Essentials study materials have their own unique learning method, abandon the traditional rote learnin... https://www.dumpleader.com/PostgreSQL-Essentials_exam.html