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NEW QUESTION # 196
Which of the following is the best description of discrete data types?
Answer: B
NEW QUESTION # 197
A data analyst has received a data set that contains actual and projected sales for the fourth quarter of 2019. Which of the following statistical methods should the analyst use to find the measure of dispersion?
Answer: C
NEW QUESTION # 198
An analyst is currently working on a ticket for revamping a company-wide dashboard that has been in use for five years. Which of the following should be the first step in the development process?
Answer: D
Explanation:
Explanation
The first step in the development process of revamping a company-wide dashboard should be to talk to the group that made the request to determine the desired goal. This would help to understand the needs, expectations, and preferences of the stakeholders, as well as the scope, purpose, and objectives of the project.
Talking to the group that made the request would also help to establish a clear communication channel, build rapport and trust, and solicit feedback and suggestions.
NEW QUESTION # 199
A sales manager requested a report that contains the first name, last name, and phone number of all the company's customers and employees. The data engineer needs to return all the records from several tables, even duplicates. Which of the following is the best way to join the two tables?
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
In SQL, different types of joins are used to combine records from two or more tables based on related columns. The choice of join affects the result set, especially concerning the inclusion of duplicates and the completeness of data retrieval.
* FULL OUTER JOIN: Retrieves all records when there is a match in either left or right table. Non- matching rows will also be included, with NULLs in place where the join condition is not met.
* INNER JOIN: Retrieves only the records that have matching values in both tables.
* LEFT OUTER JOIN: Retrieves all records from the left table and the matched records from the right table. Non-matching rows from the right table will result in NULLs.
* CROSS JOIN: Returns the Cartesian product of the two tables, meaning it combines all rows from the first table with all rows from the second table. This join includes all possible combinations, resulting in a dataset that contains all records from both tables, including duplicates.
Given the requirement to return all records from several tables, even duplicates, a CROSS JOIN is appropriate. However, it's essential to note that a CROSS JOIN can produce a very large result set, especially if the tables have many rows. Therefore, it should be used cautiously and typically with additional filtering to manage the size of the output.
NEW QUESTION # 200
What category of data stewardship work is focused on ensuring that the organization respects the wishes of data subjects?
Answer: A
NEW QUESTION # 201
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