Advanced Types: UUIDs, Arrays & Enums

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Store native UUIDv4 keys, integer/text arrays, and custom enumerated types directly in columns.

Native UUIDs & Arrays

PostgreSQL has native support for 128-bit Universally Unique Identifiers via gen_random_uuid() and multi-element typed arrays (TEXT[]).

UUID and Array Table Definition

Try It Yourself »

CREATE TABLE articles (
    article_id UUID DEFAULT gen_random_uuid() PRIMARY KEY,
    title TEXT NOT NULL,
    tags TEXT[] DEFAULT ARRAY['tech', 'web'],
    status VARCHAR(20) DEFAULT 'draft'
);

-- Querying with array operators
SELECT * FROM articles WHERE 'tech' = ANY(tags);

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Test Yourself With Exercise

+15 XP

Which built-in PostgreSQL function generates cryptographic random UUIDv4 values without external plugins?

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