Explanatory Question

What is a Lookup Column?

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Answer with Explanation

A Lookup Column creates a relationship between two tables.

Example:

An Employee table may contain a Department lookup column.

This allows each employee record to reference a Department record.

Benefits:

Data normalization
Reduced duplication
Improved reporting
Relationship management

Architect-Level Follow-up:

Lookup columns should be preferred over duplicate text fields because they maintain referential integrity and improve long-term maintainability.

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