Structured Query Language, or SQL, is a special-purpose programming language used to manage data within a relational database mangement system (RDMS).
You will find that there are multiple ways to write the same query in SQL, and some ways are better than others.
Two Parts of SQL
Data Definition Language (DDL): DDL includes commands to create a table, to drop a table, or create and drop other aspects of a database.
Data Manipulation Language (DML): DML includes commands that are used to query and modify a database. It includes the select statement for querying the database, and the insert, update, and delete statements, all for modifying the database.