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Learn PostgreSQL

Master the open-source relational database developers trust.

Free to start. Built from a single prompt. No credit card.

PostgreSQL, often called Postgres, is a free, open-source relational database known for correctness, standards-compliant SQL and a long list of features. Beyond tables and joins, it offers JSONB for document-style data, arrays, full-text search, window functions and extensions such as PostGIS for maps. It uses MVCC so readers and writers do not block each other, and transactions keep data consistent. Many web frameworks and hosted platforms default to it. You start in the psql shell creating tables with constraints. Learnr builds a personalized PostgreSQL course and teaches it through bite-sized, query-driven lessons.

How to learn PostgreSQL, step by step

Install Postgres and learn psql. Run Postgres with Docker or a native installer and connect with psql. Learn \l, \c, \dt and \d tablename so you can find your way around without a graphical tool.
Design tables with real constraints. Create tables for a small library app using identity primary keys, foreign keys, NOT NULL, UNIQUE and CHECK constraints. Choose types like text, numeric, timestamptz and boolean deliberately.
Get fluent with joins and aggregates. Load a sample database and answer questions with inner and left joins, GROUP BY and HAVING. Write each query twice, once with subqueries and once with a CTE, to compare readability.
Learn window functions and JSONB. Rank rows with row_number and compute running totals with sum over a partition. Store flexible attributes in a JSONB column, query them with the ->> operator and index them with GIN.
Read query plans and add indexes. Run EXPLAIN ANALYZE on a slow query, spot sequential scans and add a B-tree index. Learn when an index is not used, and why too many indexes slow down writes.
Handle transactions, roles and backups. Wrap related writes in BEGIN and COMMIT, create roles with limited privileges and practice pg_dump and restore. A short Learnr lesson each day keeps SQL syntax and psql commands at hand.

What you'll learn

Navigate databases with psql meta-commands like \dt and \d
Design tables with keys, constraints and proper data types
Write joins, CTEs and window functions
Use indexes and EXPLAIN ANALYZE to speed up queries
Store and query JSONB and manage roles and backups

What's inside your PostgreSQL course

A sample path Learnr builds for PostgreSQL. Your real course adapts to your goal and level.

1. Installing Postgres and using psql
2. Tables, data types and constraints
3. Querying, joins and aggregates
4. CTEs, window functions and JSONB
5. Indexes, EXPLAIN and transactions
6. Roles, backups, extensions and app connections

How long does it take to learn PostgreSQL?

Basic queries and table design take 2 to 4 weeks at 4 to 6 hours a week. Performance tuning, window functions and JSONB add another 1 to 3 months. Production administration, like replication and tuning, takes longer still.

What you need before you start

Basic SQL helps but is not required, since a course can start from SELECT. Comfort with a terminal makes psql and Docker setup much easier.

Common mistakes to avoid

Storing dates and money as text, then struggling to sort or sum them. Use timestamptz and numeric from the start.
Skipping foreign keys and constraints to move faster, which lets bad data in silently. Let the database enforce your rules.
Guessing why a query is slow. Run EXPLAIN ANALYZE and read the plan before adding indexes.

How Learnr builds your course

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Move through bite-sized lessons and interactive practice, earning XP and keeping your streak.

PostgreSQL questions, answered

Is PostgreSQL the same as SQL?

SQL is the query language; PostgreSQL is a database system that speaks it, with its own extensions. Most standard SQL you learn works in Postgres, MySQL and others with small differences.

PostgreSQL or MySQL for beginners?

Both are fine for learning. PostgreSQL is stricter about types and offers more advanced features like JSONB and window functions, which makes it a strong long-term choice for developers.