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SQL & Databases

Database Foundations4

SQL Fundamentals5

DDL: defining the structure of your data
DML: inserting, updating and deleting rows
SELECT: reading data the way you'll do it most
Filtering and pattern matching text
Set operations and built-in functions

Joins & Aggregation5

Design & Normalization4

Transactions & Performance4

PostgreSQL Deep Dive4

MySQL & MariaDB4

NoSQL & Choosing the Right Database5

Advanced SQL Toolkit5

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SQL & Databases

Database Foundations4

SQL Fundamentals5

DDL: defining the structure of your data
DML: inserting, updating and deleting rows
SELECT: reading data the way you'll do it most
Filtering and pattern matching text
Set operations and built-in functions

Joins & Aggregation5

Design & Normalization4

Transactions & Performance4

PostgreSQL Deep Dive4

MySQL & MariaDB4

NoSQL & Choosing the Right Database5

Advanced SQL Toolkit5

Learn SQL & Databases SQL Fundamentals

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DDL: defining the structure of your data

CREATE, ALTER and DROP - the SQL commands that build and change the shape of your database, plus every constraint that keeps data honest.

11 min readUpdated 2026-09-04sqlddlconstraints