Understanding SQL: DDL, DML, and Data Transformation

Introduction Structured Query Language (SQL) is the standard language for managing and manipulating relational databases. This article explores: Data Definition Language (DDL) Data Manipulation Language (DML) Filtering with WHERE Conditional logic using CASE WHEN What Are DDL and DML? SQL commands are broadly categorized into two groups: DDL and DML . Data Definition Language (DDL) DDL commands define and modify the structure of database objects. They shape of your database—creating tables, alte