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Efficient Database Relationships: Eliminating Data Redundancy

Understand the importance of database relationships in reducing data redundancy and improving efficiency of database operations. Learn different types of relationships and how to implement them effectively.

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Efficient Database Relationships: Eliminating Data Redundancy

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Presentation Transcript

  1. Relationships

  2. “Situation that exists between two relational database tables” • It stop the need for repeating data • Allows the database to be smaller in size • Makes it easier to update, add and delete information • It also makes searching the database easier

  3. Data Redundancy This is a flat file database, boo hiss!!! The problem is that we have redundancy

  4. How to solve the issue • Simply take the data out • Make another table Students Teachers

  5. Different types of relationship Table 1 Table 2 • One to One • A persons credit check • One to Many • A teacher and students • Many to Many • Online orders Table 1 Table 2 Table 1 Table 2 Important Fact This can never be made, as the database wont allow it

  6. The Task • You need to design a second table in your ERD for actors • Then you need to build the table • Add some actors into your table and link them with films. Extension Challenge Try and find the problem with using a 1 to many relationship

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