Some tools, such as erwin, are able to convert a Logical model into a Physical model for your choice of specific DBMS. Similarly, the Logical model might show human-meaningful names on relationships (such as "owns" or "borrowed book from", whereas the Physical model might show database-meaningful names on the relationships (for example the name of the FK constraint).
#ERWIN DATA MODELER VERSION HISTORY PLUS#
Whereas on a Physical model that same scenario would show tables A and B plus a third intermediate table to implement the many-to-many relationship. For example, on a Logical model you can show two tables (say A and B) with a many-to-many relationship between them. By contrast, a Logical E-R model has similar-looking symbols but they don't necessarily correspond 1-to-1 with the objects in the database. In the context of Entity-Relationship modeling, a Physical model means that the symbols on the diagram correspond to actual database objects, such as tables and constraints. contribs) 15:23, 20 March 2016 (UTC) I believe your understanding of "logical" and "physical" is mistaken.Preceding unsigned comment added by The ken evans ( talk The article should be rewritten to reflect this anomaly. Thus, the only difference between "logical model" and "physical model" is one of representation not of substance. This article uses the terms "logical model" and "physical model" to refer to the same thing: a set of tables.Ī table can be expressed as an SQL Query (DDL) or a diagram. Clarke 10:59, 28 August 2011 (UTC) Physical & Logical confusion? But who knows that it will be called tomorrow.
The ERwin web site currently seems to imply that Model Manager is now called CA ERwin Workgroup Edition. Product name changes perhaps aren't all that important to Wikipedia readers - they can alwsys look them up on the vendor web site, I guess. I beleive that "Data Modeler" and "Model Manager" are two components of the CE Erwin Modeling Suite. The article includes "The tool was later renamed to CA ERwin Model Manager." I do not think this claim is correct. Mark Renier ( talk) 07:15, 10 July 2009 (UTC) Model Manager? Can someone add an infobox showing latest version and date? Thanks. Thank you.īetacommandBot ( talk) 06:05, 2 January 2008 (UTC) application infobox needed If you have any questions please ask them at the Media copyright questions page.
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#ERWIN DATA MODELER VERSION HISTORY WINDOWS#
on Windows 2000 screenshot.png is being used on this article.
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