ITPEC IP October 2023 Question 29
ITPEC IP October 2023 — Question 29 of 100
The relational model represents data as relations, commonly displayed as tables of rows and columns. Each row is a tuple or record, each column is an attribute, and keys identify rows and connect related tables. Relational operations can select, project, join, and otherwise manipulate these tables.
Answer (c)
Why not others:
- (a) Object model represents data as objects containing state and behavior
- (b) Hierarchical model arranges records in a parent-child tree
- (d) Network model connects records through a graph-like set of links and permits multiple parents
Key rule: Rows plus columns indicate the relational model; a tree indicates hierarchical data, and linked graph records indicate the network model.
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