I have tried to focus on the tools that only do data modeling I excluded the tools that do more than data modeling. Some features do not appear on the comparison table because they are available in almost every tool. Th e tools will be compared according to the core features they have. In this article, I aim to provide a detailed comparison of the most notable data modeling tools in the market. This multitude of tools available makes it very difficult to choose a tool that suits the user's needs. Thus, data modeling tools make the Data modeling process easier and provide many features that help data modelers to understand their data.Īctually, there are many different data modeling tools available for different database platforms. Step 3: In physical model, generate a script for constructing schemas to the target DB (e.g.A data modeling tool or a datab ase modeling tool is a n application that helps data modelers to create and design databases structure. Step 2: In physical model, choose a proper DB-specific data type for each columns in tables Right click an Entity select Column Define data types for each column Step 1: Create a logical model Draw your ER diagram Supertype-Subtype Rollup (Using NULL values to combine relations) Option 1 Option 2 Option 3ġ5 ER modeling Two different models Logical model Physical modelĬonceptual modeling Independent of DBMS-specific implementations Only support subclasses and simple data types Physical model DBMS-specific modeling DBMS-specific data typesĮR modeling (Cont’d) Two different models (Cont’d) Buttons for generating DB schemas DB-specific Data types Logical model Physical model Supertype-Subtype Rolldown (Similar to Object-oriented approach, but not equal) 3. Supertype-Subtype Rollup (Using NULL values to combine relations) 1. Click the subclassġ3 Subclasses choose the strategy for converting “isa-relationship” Click is-a relationship (after clicking “sub-category” icon) (optional) 5. Click “sub-category” icon (isa relationship)Ģ. (optional) change entity nameġ2 Subclasses 1.
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Relationships Relationship properties Null allowed Configure cardinality Three cardinality options zero, one or more (above example) One or more Zero or oneĬonvert many-to-many relationships to connecting entity sets 1. Relationships O: zero, |: one, crow’s foot: many relationships Example Movies Owns Studios Identifying relationship Many-to-many relationship Non-identifying relationship Non-Identifying relationship Independent Entity Sets Dependent Entity Sets Left click attribute properties Entity set name Keys Attributes An independent entity set Entity set For relationships and weak entity sets A dependent entity set (Stars-in)Ĩ Entity Sets (Cont’d) Non-Identifying vs.
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Integration DEFinition (IDEF) Use IE Notation IE notation To use IE Notation (in menu bar) Model → Model Properties Logical Physical IDEF1X notation Logical Physicalħ Entity Sets Entity set name Entity set Keys Attributes Image from President Company max=1 min=0 min=1 Person Location max1 ĥ Notations Two notations available Information Engineering (IE) Configure the “Target Database” (In CS360, we’re using Oracle 11g) Presentation on theme: "ERwin."- Presentation transcript:ģ Create a New Model Create a new logical/physical modelĢ.