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PHP二维数组数组实现笛卡尔积,即排列组合: https://www.jb51.net/article/144708.htm //计算sku的笛卡儿积 public static function CartesianProduct($category,$type='/') {//$category, 阅读全文
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直接上sql: update order_trace a set a.delivery_time=(select delivery_time from order_express_info b where b.order_id=a.order_id limit 1 ) WHERE 1=1 AND a 阅读全文