CREATE OR ALTER PROC usp_DepositMoney (@accountId INT, @depositAmount DECIMAL(15, 4))
AS
  BEGIN TRANSACTION
  UPDATE Accounts
  SET Balance += @depositAmount
  WHERE Id = @accountId

  IF (@@ROWCOUNT <> 1)
    BEGIN
      ROLLBACK;
      RAISERROR ('Invalid account!', 16, 1);
      RETURN;
    END

  COMMIT;