Robust, reliable, and ridiculously powerful. Master the database that powers the world's most critical financial and data systems.
It's more than just tables. It's a guarantee that your data is safe and correct.
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Atomicity, Consistency, Isolation, Durability.
Ensures that even if the power fails, your bank transaction doesn't vanish halfway through.
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Data is organized into Tables (Relations) with Rows and Columns.
Strict schemas prevent "garbage in, garbage out."
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A column that references the ID of another table.
Example: An 'Order' must belong to a valid 'User'. Postgres enforces this link automatically.
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Postgres can store Binary JSON documents.
You can index and query JSON fields just like regular columns. Best of both worlds.
SQL gets its power from combining data from multiple tables. Click "Connect" to see how an Order finds its User.
Click on any row in the Orders table to see how Postgres finds the matching User.
Postgres looks at the user_id in the Order row, matches it to the id in the Users table, and creates a combined result.
SELECT Users.name, Orders.total
FROM Orders
JOIN Users ON Orders.user_id = Users.id
WHERE Orders.id = ...;
One of Postgres's superpowers is its extension system.
Adds support for geographic objects. Run queries like "Find all coffee shops within 500 meters of this GPS point."
Turn Postgres into a Vector Database. Store embeddings and perform cosine similarity search right next to your relational data.
Test your PostgreSQL proficiency.
1. What ensures a Postgres transaction is reliable even after a power loss?
2. Which feature allows you to store flexible, schema-less data in Postgres?
3. What is a Foreign Key used for?