What is data model? And types.
Download as PPTX, PDF1 like433 views
This document compares and contrasts the hierarchical data model and network data model. The hierarchical data model represents data in a tree-like structure and allows one-to-many relationships but not many-to-many. It is simpler but not suitable for representing many-to-many relationships. The network data model uses pointers to represent one-to-one, one-to-many, and many-to-many relationships, making it more complex but able to represent all relationship types. The hierarchical data model has issues with insertion, updating, and deletion operations since changes to a parent record can affect child records, but the network data model does not have these anomalies. Retrieval operations are also more complex in the
1 of 7
Downloaded 27 times
More Related Content
What's hot (20)
Ad
Similar to What is data model? And types. (20)
Ad
What is data model? And types.
- 1. Submitted By: DeepKaur Hierarchical Data Model v/s Network Data Model 1 DBMS
- 2. Why they Are Important? What is Model? 2 DBMS
- 3. Hierarchical Data Model Network Data Model E-R Data Model Types Of Data Models G.M D.G.M Sales dep. Adv. Dep. D.G.M Q.M.D 3 DBMS
- 4. Hierarchical Model v/S Network Model Having Relationship like 1:1 and 1:M But M:M relation Can’t Be expressed. Simple Useful for Hierarchical character in the DBMS. M:M Can Be expressed. Complex due to the use of Pointers. Useful For Representing M:M Relationships. 4 DBMS
- 5. Operations are : •Insertion •Updation •Deletion •Retrieve Difference On The basis Of Operations 5 DBMS
- 6. HDM Child Can’t Be Inserted Without Parent. NDM Free From Insert Anomaly. HDM Updating the data is complex. NDM Easy To Update. Insertion & Updation Opreation 6 DBMS
- 7. HDM Deletion Of (P) Record (C) will also delete. NDM Free From deletion anomalies. HDM Retrieve Algo’s are Complex. NDM Retrieve algo’s are less complex. Thanks… Deletion & Retrieve Operation 7 DBMS