PostgreSQL SERIAL and REFERENCES #30 — PostgreSQL

Problem

PostgreSQL: PostgreSQL SERIAL and REFERENCES #30

Hints

Use WITH for CTEs, OVER() for windows

Your practice code

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Solution

CREATE TABLE orders (
  id SERIAL PRIMARY KEY,
  customer_id INT NOT NULL REFERENCES customers(id),
  amount NUMERIC(12,2) NOT NULL CHECK (amount >= 0),
  created_at TIMESTAMPTZ DEFAULT NOW()
);

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Explanation

PostgreSQL: CTEs, window functions, ILIKE, JSONB @>, EXPLAIN ANALYZE.