In a relational data model, for normalization purposes, corporate office lookup, region lookup, branch lookup, and employee lookups are not merged as a single table. In a dimensional data modeling(star schema), these tables would be merged as a single table called ORGANIZATION DIMENSION for performance and slicing data. This dimension helps us to find the…
In a relational data model, for normalization purposes, product category lookup, product sub-category lookup, product lookup, and and product feature lookups are are not merged as a single table. In a dimensional data modeling(star schema), these tables would be merged as a single table called PRODUCT DIMENSION for performance and slicing data requirements. Example of…
Dimension Table: Dimension table is one that describe the business entities of an enterprise, represented as hierarchical, categorical information such as time, departments, locations, and products. Dimension tables are sometimes called lookup or reference tables. Location Dimension: In a relational data modeling, for normalization purposes, country lookup, state lookup, county lookup, and city lookups are not merged as…
How to create Identifying Relationship with Cardinality of many to many relationship: Identifying relationship: If a foreign key column/multiple foreign key columns referencing some table, becomes a part of the primary key, and then it is an identifying relationship. Employee and PROJECTS Table association: Since the relationship is many to many with Employee_No (Employee Table)…
What is Non-Identifying relationship? If a column (foreign key) / multiple columns (foreign key columns) referencing some table becomes a column in a table as a NON-PRIMARY KEY, and then it is non-identifying relationship. How to create non-identifying relationship with cardinality of 1 to many relationship in Employee Table? Example 1: Employee Table with Department…
Xcase – Overview: Xcase is a powerful and intuitive data modeling tool. It automates database creation and maintenance, making the modeling process simple and visual. The tool provides tight support for the leading DBMS and an impressive set of capabilities. Using Xcase, data modelers can create data models from scratch or from existing databases using…
How to create Data Modeling Objects in Toad? Here in this section, we will create a physical data model instead of starting from logical data model, since we can cover most of the features of a data modeling tool in the physical data model. Please refer our sections listed under Data Modeling Topic Logical Data Modeling and Data…
How to create a Physical Data Model using Erwin 4.1.4 version? 1: Change the view from “Logical to Physical” from the drop down list. 2: Click “Database” from main menu and then click “Choose Database” from the sub menu. Then select your target database server where the database has to be created. Click ok. 3:…
How to create a Logical Data Model using Erwin 4.1.4 version? In the following section, a simple example with a step by step procedure to create a logical data model with two entities and their relationship are explained in detail. 1: Open All Fusion Erwin Data Modeler software. 2: Select the view as “Logical” from…
All Fusion Erwin Data Modeler: All Fusion Erwin Data Modeler commonly known as Erwin, is a powerful and leading data modeling tool from Computer Associates. Computer Associates delivers several software for enterprise management, storage management solutions, security solutions, application life cycle management, data management and business intelligence. Parallax Capital Partners acquired Erwin and incorporated Erwin…
