AIncorrect
A sales CSV with a fixed type per column
A tabular CSV with a fixed type per column is structured data.
Because it has a fixed structure, it is not an example of unstructured data, so it is incorrect.
In a training session, to organize a suitable storage destination and analysis method for each data type, a company classifies the data it handles into structured, semi-structured, and unstructured. Which of the following are unstructured data? (Choose TWO.)
1 / 1
Select all that apply
CorrectC, E
Explanation
A question on choosing two examples of unstructured data.
- 1「are unstructured data」Choose data that has no fixed structure (schema)
- 2「Which of the following are unstructured data」Images and free text apply. Exclude tabular CSV/RDB and JSON
BIncorrect
Tagged JSON logs
JSON with tags/keys is semi-structured data.
Because it has a certain structure, it is not an example of unstructured data, so it is incorrect.
CCorrect
Images from a surveillance camera
Correct. Images are a typical example of unstructured data, which has no fixed structure such as rows and columns or tags.
DIncorrect
A customer master in an RDB table
Data in a relational database table is structured data with a fixed schema.
Because it has a fixed structure, it is not an example of unstructured data, so it is incorrect.
ECorrect
A free-form review written by a customer
Correct. Free-form text is a typical example of unstructured data, which has no fixed schema. Analyzing the text itself requires NLP.
Key Takeaway
Grasp how to identify unstructured data.
・Unstructured: no fixed structure → images, video, audio, free-form text.
・Structured: a table with fixed column types (CSV, RDB).
・Semi-structured: has tags/keys but no fixed schema (JSON, XML).
Decide instantly: 'images' and 'free text' are unstructured, 'tables' are structured, and 'JSON/XML' are semi-structured.