places1Ncontains1Nappears in1NCustomerENTITY# idPKnameemailOrderENTITY# idPK→ customer_idFKtotalplaced_atOrder lineENTITY# idPK→ order_idFK→ product_idFKquantityProductENTITY# idPKskuprice电商数据模型客户、订单、订单行和商品及其基数。ER 图停留在实体层面:连线连接方框,两端带基数。字段列表中标出键,作为模型聚合根的客户实体带强调色。在编辑器中打开