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CREATE TABLE IF NOT EXISTS Transactions (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, url TEXT NOT NULL, code INTEGER NOT NULL);

INSERT INTO transactions (url, code) VALUES
('https:/x.com/?a=1', '0'), ('https:/x.com/?a=2', '0'), ('https:/x.com/?a=3', '0');

SELECT * FROM transactions;
id url code
1 https:/x.com/?a=1 0
2 https:/x.com/?a=2 0
3 https:/x.com/?a=3 0
UPDATE transactions
SET code = 1
WHERE id = (SELECT MIN(id) FROM transactions WHERE code = 0)
RETURNING id;
id
1