So lets start with a piece of code that well be thinking about and take a few seconds to read it carefully and try to explain, in your own words, what this piece of code does.
1. 如何创建一个包含非空约束的表? A. CREATE TABLE t01(id integer, name text, score numeric); B. CREATE TABLE t01(id integer NOT NULL, name text, score numeric); C. CREATE TABLE t01(id integer UNIQUE, name text, score numeric); D. CREA…