DA0-002 Data Concepts and Environments Practice Question
A large online retailer stores customer orders in a PostgreSQL database. Each order has a unique order ID, and the database is normalized to 3NF. Which type of data is this?
⚠ Common exam trap
A common mix-up: candidates confuse 'structured data' with 'metadata' or assume that any database containing JSON fields is semi-structured, but the question specifies a normalized 3NF schema, which inherently means structured data regardless of any JSON columns.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Structured data
The data is structured because it resides in a normalized PostgreSQL database with a unique order ID and conforms to a fixed schema (3NF). Structured data is organized into rows and columns with defined data types, enabling efficient SQL querying and ACID compliance. PostgreSQL's relational model enforces this structure through tables, constraints, and indexes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Semi-structured data
Why it's wrong here
Semi-structured data carries tags or hierarchies, like JSON or XML, without a rigid relational schema. A 3NF PostgreSQL table with a unique order ID enforces fixed columns and types, which is structured data; semi-structured would apply to schema-flexible formats such as document stores.
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Structured data
Why this is correct
Records held in fixed relational tables with defined columns, primary keys and 3NF constraints are structured data. Order IDs and their attributes fit neatly into rows and columns, so they are queryable with standard SQL.
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Unstructured data
Why it's wrong here
Unstructured data lacks a predefined model, such as free text, images or audio. Orders held in normalised PostgreSQL tables with defined columns, primary keys and 3NF constraints are fully structured; unstructured would describe the retailer's product images or customer emails, not these records.
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Metadata
Why it's wrong here
Metadata describes data about data, such as column names, types or constraints, not the order records themselves. Storing order IDs and normalised attributes in PostgreSQL tables is structured data; metadata would be the schema definition, not the row contents the question asks about.
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