KwickClips Databases and SQL · 42 sec · free
Which model allows many parents?
Short answer. The network model.
Which model is most used today?
The relational model.
Three data models
| Model | Shape |
|---|---|
| Hierarchical | tree |
| Network | web of links |
| Relational | tables |
Remember
| Hierarchical: one parent |
| Network: many parents |
| Relational: tables |
Databases come in three shapes. Do you know them? Hierarchical is a tree, one parent per child. Network is a web, many parents allowed. Relational uses tables. Hierarchical, one parent. Network, many parents. Relational, tables.
This clip is from the full lesson: The Relational Model: Relation, Tuple, Attribute, Domain, Degree and Cardinality — 6 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 10 Information Technology (402), CBSE Class 12 Computer Science (083), CBSE Class 11 Informatics Practices (065), CBSE Class 11 Information Technology (802)
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