Coursera | SQL for Data Science

Module 1 Quiz >> Week 1 >> SQL for Data Science

Module 1 Quiz >> Week 1 >> SQL for Data Science

1. Question 1 Select the jobs below that may use SQL in their work (select all that apply). 1 point QA Engineer Backend Developer DBA Data Scientist Data Analyst 2. Question 2 How does a data scientist and DBA differ in how they use SQL? 1 point DBAs manage the database for other users. DBA’s are the only ones who merge datasets together. Data scientists only query the database and don’t create tables. Data scientists don’t write complex queries. 3. Question 3 Which of the following statements are true of Entity Relationship (ER) Diagrams? 1 point They speed up your querying time. They usually are represented in a visual format. They only represent entities in the diagram. They show you the relationships between tables. They are usually a representation of a business process. They identify the Primary Keys 4. Question 4 Select the query below that will retrieve all columns from the customers table. 1 point 1 SELECT (*) FROM customers 1 RETRIEVE * FROM customers 123456789 SELECT FirstName ,LastName ,Address ,City ,State ,ZipCode ,PhoneNumber FROM customers 1 SELECT * FROM customers 5. Question 5 Select the query that will retrieve only the Customer First Name, Last Name, and Company. 1 point 123456 SELECT FirstName ,LastName Company FROM customers 1 SELECT * FROM customers 123456 SELECT FirstName ,LastName ,Company FROM customers 123456 SELECT FirstName LastName Company FROM customers 6. Question 6 The ER diagram below is depicting what kind of relationship between the EMPLOYEES and CUSTOMERS tables? 1 point One-to-one One-to-many Many-to-one Many-to-many 7. Question 7 The data model depicted in the ER diagram below could be described as a _______________. 1 point Transactional Model Star Schema Relational Model 8. Question 8 When using the “CREATE TABLE” command and creating new columns for that table, which of the following statements is true? 1 point You must assign a data type to each column You can create the table and then assign data types later You must insert data into all the columns while creating the table 9. Question 9 Look at the values in the two columns below. Based on the values in each column, which column could potentially be used as a primary key? Column 1 Column 2 5 2 6 4 1 5 2 5 34 32 8 6 9 4 1 point Column 1 Column 2 Column 1 OR Column 2 10. Question 10 In order to retrieve data from a table with SQL, every SQL statement must contain? 1 point FIND WHERE CREATE SELECT

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