In the process of database design, an entity in the conceptual design phase typically becomes a _________ in the logical design phase.

Question

In the process of database design, an entity in the conceptual design phase typically becomes a _________ in the logical design phase.

BlackTom AI · Accepted Answer

In database design, there is a progression from high-level modeling to a more detailed schema; thinking at the conceptual level, an entity represents a distinct real-world object or concept. When we move to the logical design phase, that same conceptual entity is implemented as a relation, which corresponds to a table in a relational database.
Option 1: Attribute. An attribute is a property or characteristic of an entity, not the entity itself. In the logical design, attributes become the columns of a relation, not the whole relation itself.
Option 2: Relation. This is the correct characterization for the transformation from conceptual to logical design: an entity becomes a relation (a table) with its attributes forming the columns and rows representing instances.
Option 3: Row. A row (or tuple) is a single record within a relation, representing a specific instance of the relation. The row is data, not the structural unit that arises from the entity in the logical design.
Option 4: Column. A column corresponds to an attribute in the logical design, not to the entity as a whole. Columns define the properties, while rows hold the data.
Overall, the conceptual-to-logical transition centers on turning entities into relations, with attributes mapped to columns and instances into rows, which explains why "Relation" is the appropriate choice here.

In the process of database design, an entity in the conceptual design phase typically becomes a _________ in the logical design phase.

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