DISTINCT in PostgreSQL - Examples & AI Generator

Handling duplicates is a common challenge in SQL. The DISTINCT keyword in PostgreSQL helps return only unique records, but its syntax can vary by database. Remembering these details is tricky—especially if you work across different SQL systems. AI2sql skips the hassle: type what you need in plain English, and get a tested DISTINCT query for PostgreSQL in seconds. No manual coding required.

DISTINCT Syntax in PostgreSQL

Basic Structure

SELECT DISTINCT column1, column2 FROM table_name;

• Returns unique rows based on the listed columns.

• PostgreSQL-specific: You can use DISTINCT ON (columns) for advanced deduplication needs.

Advanced Example: DISTINCT ON

SELECT DISTINCT ON (customer_id) customer_id, order_date, total
FROM orders
ORDER BY customer_id, order_date DESC;

• Fetches the latest order for each customer using PostgreSQL's DISTINCT ON extension.

DISTINCT Examples You Can Generate Instantly

• Unique Customers:
  

  SELECT DISTINCT customer_name FROM customers;

• Unique Product Categories:
  

  SELECT DISTINCT category FROM products;

• Orders with Unique Status:
  

  SELECT DISTINCT status FROM orders;

Use cases like "List all unique customers", "Show different product categories", or "Get all distinct order statuses" can be generated in 10 seconds with AI2sql.

Generate DISTINCT queries in 10 seconds with AI2sql

Why Use AI2sql Instead of Manual DISTINCT Coding

• Instant DISTINCT query generation—no syntax to memorize.

• Switch databases (MySQL, PostgreSQL, SQL Server) without learning each variant.

• Trusted by 50,000+ users in 80+ countries to save time on repetitive SQL.

• Just describe your need (“Find unique product names”), and AI2sql delivers a ready-to-run query.

With AI2sql, you can focus on insights, not query syntax.

Frequently Asked Questions

• Q: Can I use DISTINCT on multiple columns in PostgreSQL?
  A: Yes, just list them in the SELECT clause: SELECT DISTINCT col1, col2 FROM table;

• Q: What's the difference between DISTINCT and DISTINCT ON?
  A: DISTINCT ON (unique to PostgreSQL) lets you choose the first row from each group, ordered by your criteria.

• Q: Do I need any special setup to use DISTINCT in PostgreSQL?
  A: No. DISTINCT is built into all PostgreSQL installations.

Ready to skip manual coding and generate DISTINCT PostgreSQL examples instantly? Try AI2sql Generator or Learn DISTINCT for more tips.

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