Microsoft Azure Data Fundamentals DP-900 Practice Question
You are reviewing an Azure SQL Database that stores customer and order data in a single wide table. Management asks why you propose splitting the table into separate Customer and Order tables linked by a foreign key. Which benefit of normalization does this design change provide?
It automatically partitions the database across Azure regions for disaster recovery.
It removes the need for joins because all required data will reside in one table.
It converts the schema to a non-relational model suitable for a document database.
It reduces data redundancy and prevents update anomalies by storing each fact only once.
Normalization structures a relational database so that each fact is stored only once, typically by dividing data into related tables that reference each other with keys. This minimizes redundant copies of the same values and removes the update, insert, and delete anomalies that can occur when repetition exists. The change does not eliminate joins-in practice it creates them-nor does it automatically create geographic partitions or turn the data into a non-relational format.
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Microsoft Azure Data Fundamentals DP-900
Identify considerations for relational data on Azure
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