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Database Management Systems (DBMS) – PART 10
represents how the model will be built in the database. A physical database
model shows all table structures, including column name, column data type,
column constraints, primary key, foreign key, and relationships between tables.
Features of a physical data model include:
tables and columns.
database model is a data model in which the data is
organized into a tree-like structure.
The data is stored as records which
are connected to one another through links. A record is a collection of fields, with each field
containing only one value. The entity
type of a record defines which fields the record contains.
model is a database
model conceived as a flexible way of representing
objects and their relationships. Its distinguishing feature is that the schema,
viewed as a graph in which object types are nodes and relationship types are
arcs, is not restricted to being a hierarchy or lattice.
thus allowing more general connections among the nodes. The main difference of
the network model from the hierarchical model, is its ability to handle many to
many (N:N) relations. In other words, it allows a record to have more than one
grouped into relations. A database organized in terms of the relational
model is a relational database.
specifying data and queries: users directly state what information the database
contains and what information they want from it, and let the database
management system software take care of describing data structures for storing
the data and retrieval procedures for answering queries.
in computer memory?
have n- children?
the drawbacks of hierarchical model?
attributes are established in: