如批量更新采购订单行sequence字段，按照订单行id的顺序赋值1，2，3，4...：

UPDATE purchase_order_line_copy1
SET sequence = subquery.new_sequence
FROM (
    SELECT id, ROW_NUMBER() OVER (ORDER BY id) AS new_sequence
    FROM purchase_order_line
		WHERE order_id = 748
) AS subquery
WHERE purchase_order_line_copy1.id = subquery.id 
and purchase_order_line_copy1.order_id = 748

限制订单为748的订单行，更新订单行sequence字段，效果如下：