Microsoft Azure Data Fundamentals DP-900 Practice Question
An online retail company stores data in Azure SQL Database. Customer information is kept in a Customers table, and each purchase is saved in an Orders table that includes a CustomerID column. The business wants a single query that returns every customer name together with the date of each order they placed. Which feature of relational data makes this possible?
The ability to join tables on matching key columns
Storage of nested arrays within a single column
Schema-on-read parsing of semi-structured data
Automatic horizontal scaling across multiple shards
Relational databases can combine data from two or more tables when those tables share related key columns. A JOIN operation links rows in the Customers table to matching rows in the Orders table through the CustomerID column, allowing one SELECT statement to return customer names and their corresponding order dates. Horizontal scaling, schema-on-read, and storing nested arrays are not required for this task and are not core relational features that enable combining rows from different tables.
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Microsoft Azure Data Fundamentals DP-900
Identify considerations for relational data on Azure
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