Question 2 in which of the following situations would a data analyst use sql instead of a spreadsheet? select all that apply.

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Question 1

The manage stage of the data life cycle is when a business decides what kind of data it needs, how the data will be handled, and who will be responsible for it.

During planning, a business decides what kind of data it needs, how it will be managed throughout its life cycle, who will be responsible for it, and the optimal outcomes.

Question 2

A data analyst has finished an analysis project that involved private company data. They erase the digital files in order to keep the information secure. This describes which stage of the data life cycle?

• Manage
• Destroy
• Plan
• Archive

This describes the destroy phase, during which data analysts use secure data-erasure software and shred paper files to protect private information.

Question 3

In the analyze phase of the data life cycle, what might a data analyst do? Select all that apply.

• Use a formula to perform calculations
• Use spreadsheets to aggregate data
• Create a report from the data
• Choose the format of spreadsheet headings

In the analyze phase of the data life cycle, a data analyst might use formulas to perform calculations, create a report from the data, or use spreadsheets to aggregate data.

Question 4

Describe how the data life cycle differs from data analysis.

• The data life cycle deals with transforming and verifying data; data analysis is using the insights gained from the data.
• The data life cycle deals with the stages that data goes through during its useful life; data analysis is the process of analyzing data.
• The data life cycle deals with making informed decisions; data analysis is using tools to transform data.
• The data life cycle deals with identifying the best data to solve a problem; data analysis is about asking effective questions.

The data life cycle involves stages for identifying needs and managing data. Data analysis involves process steps to make meaning from data.

Question 5

A company takes insights provided by its data analytics team, validates them, and finalizes a strategy. They then implement a plan to solve the original business problem. This describes which step of the data analysis process?

• Analyze
• Process
• Share
• Act

The act phase is when insights are put into action.

Question 6

Fill in the blank: Spreadsheets are _____ that can be used to store, organize, and sort data.

• digital worksheets
• formulas and functions
• interactive dashboards
• visual representations

Spreadsheets are digital worksheets that can be used to store, organize, and sort data.

Question 7

Fill in the blank: A formula is a set of instructions used to perform a specified calculation; whereas a function is _____.

• a question written by the user
• a predefined operation
• a computer programming language
• a particular value

A formula is a set of instructions used to perform a specified calculation; a function is a preset command that automatically performs a specified process.

Question 8

Fill in the blank: A query is used to _____ information from a database. Select all that apply.

• update
• request
• retrieve
• analyze

A query enables data analysts to request, retrieve, and update information from a database.

Question 9

Structured query language (SQL) enables data analysts to communicate with a database.

SQL allows a data analyst to communicate with a database in order to retrieve and manipulate data.

Question 10

The graphical representation of information helps stakeholders understand data insights. Formulas and functions make this possible.

The graphical representation of information is made possible by data visualization tools. These tools help stakeholders understand data insights.

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Question 1

Data analysts choose SQL for which of the following reasons? Select all that apply.

• SQL is a well-known standard in the professional community
• SQL can handle huge amounts of data
• SQL is a powerful software program
• SQL is a programming language that can also create web apps

Correct. Data analysts choose SQL because it is a well-known standard in the professional community. SQL can also handle huge amounts of data.

Question 2

In which of the following situations would a data analyst use spreadsheets instead of SQL? Select all that apply.

• When using a language to interact with multiple database programs
• When working with a small dataset
• When working with a dataset with more than 1,000,000 rows
• When visually inspecting data

Correct. An analyst would choose to use spreadsheets instead of SQL when visually inspecting data or working with a small dataset.

Question 3

A data analyst creates many new tables in their company’s database. When the project is complete, the analyst wants to remove the tables so they don’t clutter the database. What SQL commands can they use to delete the tables?

• DROP TABLE IF EXISTS
• INSERT INTO
• CREATE TABLE IF NOT EXISTS
• UPDATE

Correct. The analyst can use the DROP TABLE IF EXISTS query to delete the tables so they don’t clutter the database.

Question 4

A data analyst is cleaning customer data for an online retail company. They are working with the following section of a database:

The analyst wants to retrieve the first two letters of each state so that all the entries are consistent and only contain 2 letters. What is the correct SQL clause to retrieve the first two letters of each state?

• DISTINCT(state, 1, 2)
• SUBSTR(state, 1, 2)
• WHERE(state, 1, 2)
• LENGTH(state, 1, 2)

Correct. The correct clause is SUBSTR(state, 1, 2)*.*

Question 5

A data analyst is cleaning a dataset. They find data entries with extra spaces. What SQL function can the analyst use to eliminate the extra spaces for consistency?

Correct. The analyst can use the TRIM function to eliminate the extra spaces for consistency.

Question 6

In SQL databases, what data type refers to a number that contains a decimal?

• Integer
• Boolean
• String
• Float

Correct. In SQL databases, the float data type refers to a number that contains a decimal.

Question 7

A data analyst is working with product sales data. They import new data into a database. The database recognizes the data for product price as text strings. What SQL function can the analyst use to convert text strings to floats?

Correct. The analyst can use the CAST function to convert text strings to floats.

Question 8

A data analyst is cleaning survey data. The results for an optional question contain many nulls. What function can the analyst use to eliminate the null values from the results?

• CONCAT
• COALESCE
• CAST
• LENGTH

Correct. The analyst can use the COALESCE function to eliminate the null values from the results.