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Thus, you can create different diagrams to visualize different portions of the database, or to accentuate different aspects of the design. For example, you can create a large diagram showing all tables and columns, and you can create a smaller diagram showing all tables without showing the columns. Within a database diagram, each table can appear with three distinct features: Row Selector You can click the row selector to select a database column in the table. The row selector displays a key symbol if the column is in the table's primary key.
Property Columns The set of property columns is visible only in the certain views of your table. You can view a table in any of five different views to help you manage the size and layout of your diagram. Within a database diagram, each relationship can appear with three distinct features: The UML representation of an association is a line connecting the two associated classes. At each end of the line there is optional notation.
For example, we can indicate, using an arrowhead that the pointy end is visible from the arrow tail. We can indicate ownership by the placement of a ball, the role the elements of that end play by supplying a name for the role, and the multiplicity of instances of that entity the range of number of objects that participate in the association from the perspective of the other end. Entity classes model long-lived information handled by the system, and sometimes the behavior associated with the information.
They should not be identified as database tables or other data-stores. They are drawn as circles with a short line attached to the bottom of the circle.
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