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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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Set operations and built-in functions

UNION, INTERSECT and EXCEPT for combining query results, plus the string, date and NULL-handling functions you'll use in nearly every real query.

12 min readUpdated 2026-09-04sqlset-operationsfunctionsfundamentals