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SQL & Databases

Database Foundations4

SQL Fundamentals5

Joins & Aggregation5

Design & Normalization4

Transactions & Performance4

PostgreSQL Deep Dive4

MySQL & MariaDB4

NoSQL & Choosing the Right Database5

Advanced SQL Toolkit5

Views and materialized views
Stored procedures, functions, and triggers
Upserts, sequences, and generated keys
Recursive CTEs and hierarchical data, properly
Classic SQL patterns: nth highest, duplicates, and gaps

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SQL & Databases

Database Foundations4

SQL Fundamentals5

Joins & Aggregation5

Design & Normalization4

Transactions & Performance4

PostgreSQL Deep Dive4

MySQL & MariaDB4

NoSQL & Choosing the Right Database5

Advanced SQL Toolkit5

Views and materialized views
Stored procedures, functions, and triggers
Upserts, sequences, and generated keys
Recursive CTEs and hierarchical data, properly
Classic SQL patterns: nth highest, duplicates, and gaps

Learn SQL & Databases Advanced SQL Toolkit

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Classic SQL patterns: nth highest, duplicates, and gaps

The exact query patterns asked in real SQL interviews and needed in real reporting work - solved using everything from this entire course.

12 min readUpdated 2026-09-04sqlinterview-patternscapstonehands-on