For sa & d projects , redundant relationships are retained only when different entity occurrences of the detail entity are accessed by different access path . for sa & d projects , any double v structures ( two detail entities are having the same two master entities ) are resolved by either merging the two detail entities or inserting some missing entities 对于系统分析及设计的计划，任何双v型结构（即两个详细数据实体拥有两个相同的主实体）可以由两个方法处理：将两个详细数据实体合并，或加上一些数据实体。
Power - supply marketing ( dss ) can collect all kinds of scattering detailed data source , and make data warehouse ( dw ) faced to all kinds of topics , at the same time , dug the instinct law of the task and the quantity information accessed impossibly by manpower , and then based on these quantity information , make more scientific power - supply marketing dss 电力营销决策支持系统（ dss ）能够收集分散的各种详细数据源，建立以各种主题为导向的数据仓库，并从中挖掘业务的内在规律和人力不可为之的数量信息，以此数量信息为支持，制定出较科学的电力营销决策。
For example , the epd now maintains electronic plans of the water catchment areas for every beach that it monitors . the plans are rapidly retrievable and easy to update . most importantly , they mark all potential pollution hazards clearly , and include detailed information about sewage treatment facilities in the area , noting their treatment methods and normal daily discharge rates 例如，本署现已备存监测计划下每个泳滩的集水区电子图则，这些图则存取快捷，更新方便，最重要的是图则能清晰标示每个泳滩的潜在污染源，并涵盖区内污水处理设施的详细数据，包括污水处理方法和每日排放量。
Now it seems very important for the enterprise to develop the customer relationship management ( crm ) strategy . crm - oriented marketing decision support system can help man collect all kinds of scattered and detailed data , mine the instinct laws of the task and the quantity information related to customer , and then based on these information assist man to pursue a better crm 面向客户关系管理的电力营销决策支持系统（ dss ）能够收集分散的各种详细数据，建立以各种主题为导向的客户数据仓库，从中挖掘潜在的规则和模式，并以此数量信息为支持，为开展电力企业客户关系管理提供较科学的决策支持。
Electric power marketing decision support system can collect all kinds of scattering detailed data source , and make data warehouse ( dw ) faced to all kinds of topics , at the same time , dug the instinct law of the task and the quantity information accessed impossibly by manpower , and then based on these quantity information , make more scientific electric power marketing dss 电力营销决策支持系统（ dss ）能够收集分散的各种详细数据源，建立以各种主题为导向的数据仓库，并从中挖掘业务的内在规律和人力不可为之的数量信息，以此数量信息为支持，制定出较科学的电力营销决策。
