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15123 entity relational diagram
1. INFM 603 – Information Technology
and Organizational Context
Lecture 8
Entity Relationship Diagrams
2. 2
Entity
• “An entity is a business object that
represents a group, or category of data.”1
• Do we know a similar concept?
1) Stephens, R.K. and Plew. R.R., 2001. Database Design. SAMS, Indianapolis , IN.
3. 3
Attribute
• “An attribute is a sub-group of information
within an entity.”1
• Do we know a similar concept?
1) Stephens, R.K. and Plew. R.R., 2001. Database Design. SAMS, Indianapolis , IN.