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此概念图以 IHMC CmapTools 创建, 内含信息有关于: BoZhao_db_cmap, Logical Model consist of attribute, ORDER BY gives you contol over the oder rows appear, tables doesn't have multiple columns holding the same kind of data can be defined as atomic data, moved to the file server stores and allows applications running on PCs to, text boxes which are used for show the data from one field, Logical Model consist of relationship, No Action means stop the deletion of the parent, On Update contains Cascade, keys (primary&foreign) can be divided as foreign key, None is considered as objects have no relationship, A multi-table, single-user database is consist of Forms, modification anomalies which is divided into update, Seven Layers of Wisdom can be divided into Data Storage, physical describes the functionality encapsulated logical, Forms contains text boxes, First Normal Form (1NF) is a description of a basic table, Data Integrity has three types of errors, logical can be understand by both users, properties (fields) one property for each table table, declarative referential integrity will keep the values in foreign and primary keys in synchronization