SQL is at its heart, the way we communicate with data. The first step is designing the "shape" of our data, which is frequently achieved using the CREATE TABLE statement: we define the columns and what data types they contain (INT, VARCHAR, etc), as well as any constraints (such as NOT NULL (mus...
Source: [Dev.to](https://dev.to/danson/from-tables-to-insights-a-beginners-journey-into-sql-36n4)