All Weeks SQL for Data Science with R Coursera Quiz Answers
Much of the world’s data resides in databases. SQL (or Structured Query Language) is a powerful language that is used for communicating with and extracting data from databases. Working knowledge of databases and SQL is a must if you want to become a data scientist.
The purpose of this course is to introduce relational database concepts and help you learn and apply foundational knowledge of the SQL and R languages. It is also intended to get you started with performing SQL access in a data science environment.
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SQL for Data Science with R Week 01 Quiz Answers
Graded Quiz: Basic SQL
Q1. True or False: The SELECT statement is called a query, and the output we get from executing the query is called a result set.
- True
- False
Q2. True or False: The INSERT statement can be used to insert multiple rows in a single statement.
- True
- False
Q3. Assume there exists an INSTRUCTOR table with several columns including FIRSTNAME, LASTNAME, etc. Which of the following is the most likely result set for the following query:
SELECT DISTINCT(FIRSTNAME) FROM INSTRUCTOR
- LEON
LEON
PAUL
PAUL
- LEON
PAUL
JOE
- LEON
PAUL
LEON
JOE
- LEON KATSNELSON
PAUL ZIKOPOLOUS
JOE SANTARCANGELO
Q4. What does the following SQL statement do?
UPDATE INSTRUCTOR SET LASTNAME = ‘Brewster’ WHERE LASTNAME = ‘Smith’
- Changes all rows for the instructor with a last name of Smith to have a last name of Brewster.
- Change the row for the instructor with a last name of Brewster to have a last name of Smith.
- Change all rows in the table to have a last name of Smith.
- Change all rows in the table to have a last name of Brewster.
Q5. Which of the following SQL statements will delete the authors with IDs of A10 and A11?
- DELETE FROM AUTHOR WHERE AUTHOR_ID IS (‘A10’, ‘A11’)
- DELETE FROM AUTHOR WHERE AUTHOR_ID IN (‘A10’, ‘A11’)
- DELETE (‘A10’, ‘A11’) FROM AUTHOR
- D: DELETE AUTHOR_ID IS (‘A10’, ‘A11’) FROM AUTHOR
SQL for Data Science with R Week 02 Quiz Answers
Graded Quiz: Relational DB Concepts and Tables
Q1. The primary key of a relational table uniquely identifies each _______ in a table.
- row
- column
- relation
- attribute
Q2. Which of the following statements about a database is/are correct?
- A database is a logically coherent collection of data with some inherent meaning
- Data can only be added and queried from a database, but not modified.
- Only SQL can be used to query data in a database.
- All of the above
Q3. Attributes of an entity become ________ in a table.
- rows
- columns
- constraints
- keys
Q4. What are the basic categories of the SQL language based on functionality?
- Data Definition Language
- Data Manipulation Language
- Both of the above
- None of the above
Q5. The CREATE TABLE statement is a….
- DML statement
- DDL statement
- Both of the above
SQL for Data Science with R Week 03 Quiz Answers
Graded Quiz: Refining Your Results
Q1. You want to select author’s last name from a table, but you only remember the author’s last name starts with the letter B, which string pattern can you use?
- SELECT lastname from author where lastname like ‘B#’
- SELECT lastname from author where lastname like ‘B%’
- SELECT lastname from author where lastname like ‘B$’
- None of the above
Q2. In a SELECT statement, which SQL clause controls how the result set is displayed?
- ORDER BY clause
- ORDER IN clause
- ORDER WITH clause
Q3. Which of the following can be used in a SELECT statement to restrict a result set?
- HAVING
- WHERE
- DISTINCT
- All of the above
Q4. When querying a table called Author that contains a list of authors and their country of residence, which of the following queries will return the number of authors from each country?
- SELECT Country, count(Country) FROM Author GROUP BY Country
- SELECT Distinct(Country) FROM Author
- SELECT Country, count(Country) FROM Author
- SELECT Country, distinct(Country) FROM Author GROUP BY Country
Q5. You want to retrieve a list of books that have between 450 and 600 pages. Which clause would you add to the following SQL statement: SELECT Title, Pages FROM Book ________________________________
- IF Pages >= 450 and Pages <= 600
- WHERE Pages >= 450 and pages <= 600
- WHERE Pages = 450
- WHERE Pages 450 – 600
SQL for Data Science with R Week 04 Quiz Answers
Graded Quiz: R and Relational Databases
Q1. Which amongst the following is the simplest way to update individual observations in a dataframe?
- Store the data in a relational database instead and make the updates there.
- Convert the dataframe into a text file and make the changes there.
- Make the updates in the dataframe and then store the results in a binary format.
- There is no way to update individual observations directly in a dataframe.
Q2. Which R function loads multiple R data structures from a .Rda file?
- readRDS()
- load()
- save()
- save.image()
Q3. A variable in R is like which of the following relational database concept?
- Schema
- Row (or tuple)
- Column (or attribute)
- Table
Q4. Which R variable holds the platform numeric limits for your R environment?
- .Computer
- .Numeric
- .Precision
- .Machine
Q5. What is declarative referential integrity?
- Protects databases from the corruption, destruction, or removal of data.
- Validates data normalization.
- Manages transactions by adhering to the ACID properties.
- Manages dependency relationships between two tables.
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This Course is a part of the Applied Data Science with R Specialization.
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This course is intended for audiences of all experiences who are interested in learning about Data Analytics in a business context; there are no prerequisite courses.
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