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CREATE TABLE users (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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username VARCHAR(64) NOT NULL UNIQUE,
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email VARCHAR(255) NOT NULL UNIQUE,
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password CHAR(64) NOT NULL,
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is_active BOOLEAN NOT NULL DEFAULT TRUE,
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role VARCHAR(32) NOT NULL DEFAULT 'user',
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created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
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updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
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);
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CREATE TABLE posts (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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author_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
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title VARCHAR(200) NOT NULL,
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slug VARCHAR(200) NOT NULL UNIQUE,
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body TEXT NOT NULL,
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status VARCHAR(16) NOT NULL DEFAULT 'draft'
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CHECK (status IN ('draft', 'published', 'archived')),
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view_count INTEGER NOT NULL DEFAULT 0,
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published_at TIMESTAMP,
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created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
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);
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SELECT
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u.username,
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u.email,
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p.title,
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p.status,
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p.view_count
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FROM users u
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JOIN posts p ON p.author_id = u.id
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WHERE u.is_active = TRUE
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AND p.status != 'archived'
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ORDER BY p.created_at DESC
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LIMIT 20;
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WITH cte AS (
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SELECT author_id, COUNT(*) AS cnt
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FROM posts
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GROUP BY author_id
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)
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SELECT u.username, cte.cnt
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FROM users u
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JOIN cte ON cte.author_id = u.id;
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UPDATE posts
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SET status = 'archived',
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updated_at = CURRENT_TIMESTAMP
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WHERE published_at < datetime('now', '-1 year')
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AND status = 'published';
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SELECT
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NULL AS maybe_value,
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COALESCE(u.email, 'no-email') AS safe_email,
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CASE
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WHEN p.view_count > 1000 THEN 'popular'
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WHEN p.view_count > 100 THEN 'moderate'
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ELSE 'quiet'
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END AS popularity
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FROM users u
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LEFT JOIN posts p ON p.author_id = u.id;
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