UPDATE user_subscription 
SET 
    expire_date = DATE_ADD(expire_date, INTERVAL DATEDIFF('2023-09-01', DATE(expire_date)) DAY),
    last_renew = DATE_ADD(last_renew, INTERVAL DATEDIFF('2023-09-01', DATE(last_renew)) DAY)
WHERE user_type = 'VIP';

UPDATE audit_log 
SET 
    start_time = STR_TO_DATE(CONCAT('2023-09-01 ', TIME(start_time)), '%Y-%m-%d %H:%i:%s'),
    end_time = STR_TO_DATE(CONCAT('2023-09-01 ', TIME(end_time)), '%Y-%m-%d %H:%i:%s') 
WHERE log_month = 8;

UPDATE product_schedule 
SET
    manufacture_date = CASE 
        WHEN TIME(manufacture_date) IS NOT NULL 
        THEN CONCAT('2023-Q3', ' ', TIME(manufacture_date)) 
        ELSE '2023-09-01' END,
    inspection_date = DATE_FORMAT(NOW(), '%Y-%m-%d') + INTERVAL HOUR(inspection_date) HOUR 
                       + INTERVAL MINUTE(inspection_date) MINUTE
WHERE factory_id = 1024;

-- 啟用事務保證一致性
START TRANSACTION;

-- 分批次更新（每次5萬條）
UPDATE financial_records 
SET 
    value_date = DATE_FORMAT(value_date, '2023-09-01 %H:%i:%s'),
    clear_date = DATE_ADD(clear_date, INTERVAL 2 DAY) 
WHERE id BETWEEN 1 AND 50000;

COMMIT;

DELIMITER $$
CREATE PROCEDURE batch_update_dates(IN new_date DATE)
BEGIN
    DECLARE done INT DEFAULT 0;
    DECLARE cur_id INT;
    
    DECLARE cur CURSOR FOR 
        SELECT id FROM orders WHERE status = 'pending';
        
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
    
    OPEN cur;
    
    read_loop: LOOP
        FETCH cur INTO cur_id;
        IF done THEN
            LEAVE read_loop;
        END IF;
        
        UPDATE orders 
        SET 
            estimate_date = CONCAT(new_date, ' ', TIME(estimate_date)),
            actual_date = DATE_ADD(actual_date, INTERVAL DATEDIFF(new_date, DATE(actual_date)) DAY)
        WHERE id = cur_id;
    END LOOP;
    
    CLOSE cur;
END
$$
DELIMITER ;

SET time_zone = '+8:00';
UPDATE ... CONVERT_TZ(create_time,'UTC','Asia/Shanghai')