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CompTIA Data+ Certification Exam Sample Questions (Q93-Q98):

NEW QUESTION # 93
Mario works with a group of R programmers tasked with copying data from an accounting system into a data warehouse.
In what phase are the group's R skills most relevant?

  • A. Purge.
  • B. Transform.
  • C. Load.
  • D. Extract.

Answer: B

Explanation:
Correct answer C. Transform
The R programming language is used to manipulate and model data.
In the ETL process, this activity normally takes place during the Transform phase.
The Extract and Load phases typically use database-centric tools.
Purging data from database is typically done using SQL.


NEW QUESTION # 94
You are a database administrator and you create a precompiled query that is stored on the database server.
What have you created?

  • A. Parameterized query.
  • B. Query execution plan.
  • C. Function as a service.
  • D. Stored procedure.

Answer: D

Explanation:
A stored procedure is a set of Structured Query Language (SQL) statements with an assigned name, which are stored in a relational database management system (RDBMS) as a group, so it can be reused and shared by multiple programs.
SQL Server stored procedure is a batch of statements grouped as a logical unit and stored in the database. The stored procedure accepts the parameters and executes the T-SQL statements in the procedure, returns the result set if any.


NEW QUESTION # 95
Which of the following describes the method of sampling in which elements of data are selected randomly from each of the small subgroups within a population?

  • A. Stratified
  • B. Systematic
  • C. Simple random
  • D. Cluster

Answer: B


NEW QUESTION # 96
Emma is working in a data warehouse and finds a finance fact table links to an organization dimension, which in turn links to a currency dimension that not linked to the fact table.
What type of design pattern is the data warehouse using?

  • A. Comet.
  • B. Star.
  • C. Sun.
  • D. Snowflake.

Answer: D

Explanation:
Correct answer C. Snowflake.
Since the dimension links to a dimension that isn't connected to the fact table, it must be a Snowflake, with a Star, all dimensions link directly to the fact table, Sun and Comet are not data warehouse design patterns.


NEW QUESTION # 97
Which of the following is a characteristic of a relational database?

  • A. It uses minimal memory.
  • B. It has undefined fields.
  • C. It utilizes key-value pairs.
  • D. It is structured in nature.

Answer: D


NEW QUESTION # 98
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