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CREATE OR REPLACE PROCEDURE prc_cus_balance_update (p_inv_number IN NUMBER) AS inv_total NUMBER; BEGIN SELECT INV_TOTAL INTO inv_total FROM INVOICE WHERE INV_NUMBER = p_inv_number; UPDATE CUSTOMER SET CUS_BALANCE = CUS_BALANCE - inv_total WHERE CUS_CODE = (SELECT CUS_CODE FROM INVOICE WHERE INV_NUMBER = p_inv_number); END;

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