Information placed in rows and columns follows a fixed schema, which is a hallmark of structured data. A fixed schema allows a platform to enforce data types and facilitate queries using languages like SQL (Structured Query Language). The other options reference alternatives that do not rely on uniform columns across records, which makes them harder to work with using relational methods.
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What is structured data?
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What is a schema in the context of databases?
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Why is SQL important for managing structured data?