If we look at the update of the bill_items, all we are doing is updating a discount based on information from the customer table, which we had when we first built the bill_items table.

如果我们看一下对bill_items的更新，我们所做的就是基于来自customer表的信息来更新discount，这个我们在首次构建bill_items表时已经掌握了。

youdao

If we look at the update of the bill_items, all we are doing is updating a discount based on information from the customer table, which we had when we first built the bill_items table.

如果我们看一下对bill_items的更新，我们所做的就是基于来自customer表的信息来更新discount，这个我们在首次构建bill_items表时已经掌握了。

youdao