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CREATE TABLE accounts ( id INT PRIMARY KEY, balance NUMERIC ); CREATE OR REPLACE PROCEDURE transfer_funds( from_account INT, to_account INT, amount NUMERIC ) LANGUAGE plpgsql AS $$ BEGIN -- Начинаем внутреннюю транзакцию -- BEGIN -- Снимаем средства UPDATE accounts SET balance = balance - amount WHERE id = from_account; -- END; END; $$; CALL transfer_funds(1, 2, 100.00);

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