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Crash Course: Data Persistence in a Weekend Practice Test 20

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Q1Domain Verified
In a relational database, what is the primary purpose of a foreign key constraint?
To ensure that a column contains only unique values
To enforce referential integrity between related tables
To automatically encrypt sensitive column data
To create an index for faster query performance
Q2Domain Verified
When designing a database schema, which scenario most clearly violates third normal form (3NF)?
A table with no candidate keys other than the primary key
A table containing a column that is functionally dependent on a non-key attribute
A table where the primary key consists of multiple columns
A table where all non-key attributes are dependent on the full primary key
Q3Domain Verified
In a database transaction with ACID properties, what does the "I" (Isolation) property guarantee?
The database remains in a consistent state before and after the transaction
Once committed, transaction results are permanently stored
All operations in the transaction are completed or none are
Concurrent transactions cannot interfere with each other's intermediate states

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This domain protocol is rigorously covered in our 2026 Elite Framework. Every mock reflects direct alignment with the official assessment criteria to eliminate performance gaps.

This domain protocol is rigorously covered in our 2026 Elite Framework. Every mock reflects direct alignment with the official assessment criteria to eliminate performance gaps.

This domain protocol is rigorously covered in our 2026 Elite Framework. Every mock reflects direct alignment with the official assessment criteria to eliminate performance gaps.

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