Reduction of ER Diagram to Table
An Entity-Relationship (ER) diagram visually represents a database structure. For actual implementation, we convert it into relational tables ÔÇö a process called reduction of an ER diagram to table format. This guide walks through the essential steps.
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Conversion Rules
1. Entity Types Become Tables
Each entity set becomes its own table ÔÇö e.g., LECTURE, STUDENT, SUBJECT, COURSE become individual tables.
2. Single-Valued Attributes Become Columns
Each single-valued attribute becomes a column ÔÇö STUDENT gets STUDENT_ID, STUDENT_NAME.
3. Key Attributes Become Primary Keys
The key attribute that uniquely identifies each row becomes the primary key (e.g., STUDENT_ID, COURSE_ID).
4. Multivalued Attributes Need Separate Tables
A multivalued attribute like HOBBY needs its own table STUD_HOBBY with STUDENT_ID + HOBBY forming a composite primary key.
5. Composite Attributes Are Split
A composite attribute like ADDRESS is split into atomic columns: DOOR#, STREET, CITY, STATE, PIN.
6. Derived Attributes Are Not Stored
Derived attributes like AGE (calculated from DATE_OF_BIRTH) are not stored as columns.
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Conclusion
Following these steps reduces an ER diagram to a set of normalized relational tables, preserving data integrity and enabling efficient querying. For more foundational database concepts, stay tuned with .
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