Which category of data is typically stored in rows and columns with a fixed schema?

Question

BlackTom AI · Accepted Answer

Structured data is organized into rows and columns governed by a fixed schema.

1. Relevant knowledge points and concepts
- Structured data: data stored in fixed schemas—tables with rows (records) and columns (fields) where each column has a defined data type and constraints. Commonly held in relational databases and spreadsheets. Easily queried by SQL.
- Unstructured data: lacks a predefined data model or schema; examples include plain text, images, audio, and video. Requires processing (e.g., NLP, image analysis) to extract structure.
- Semi-structured data: has organizational properties (tags, keys) but no rigid schema—examples include JSON, XML, and CSVs with inconsistent columns.
- Transient data: refers to data with a short lifespan or ephemeral nature (e.g., session data, cache), not a storage format classification.

2. Step-by-step reasoning
- The phrase “stored in rows and columns with a fixed schema” explicitly describes a tabular format where structure and types are predefined.
- Relational database tables exemplify this: each row is an instance/record; each column is a field with a defined data type (integer, varchar, date).
- Because the question emphasizes both rows/columns and a fixed schema, the best match is structured data.

3. (No numeric calculations required; logical mapping provided)

4. Why the correct answer is correct
- Structured data’s defining characteristic is precisely a fixed schema and tabular storage. This makes it ideal for consistent, transactional, and queryable storage—exactly the scenario described.

5. Why the other options are incorrect
- Unstructured data: lacks rows/columns and a fixed schema, so it doesn’t match.
- Semi-structured data: has some organization (e.g., key-value pairs) but not a rigid rows-and-columns schema.
- Transient data: describes lifespan/usage, not a storage format defined by rows/columns and schema.

6. Conclusion
The correct choice is Structured data, which matches the provided answer.

Which category of data is typically stored in rows and columns with a fixed schema?单项选择题

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