您可以用来LOAD DATA INFILE将800,000行数据批量加载到临时表中，然后使用多表UPDATE语法将现有表连接到临时表并更新数量值。
例如：
CREATE TEMPORARY TABLE your_temp_table LIKE your_table;
LOAD DATA INFILE '/tmp/your_file.csv'
INTO TABLE your_temp_table
FIELDS TERMINATED BY ','
(id, product, sku, department, quantity);
UPDATE your_table
INNER JOIN your_temp_table on your_temp_table.id = your_table.id
SET your_table.quantity = your_temp_table.quantity;
DROP TEMPORARY TABLE your_temp_table;
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