Hive-SQL Queries_习题及答案

一、选择题

1. Hive-SQL is a query language used for managing and manipulating data stored in Hadoop Distributed File System (HDFS). 答案：A

A. True
B. False
C. Both A and B
D. None of the above

2. Hive-SQL is used for querying, updating, and manipulating data stored in which file system? 答案：A

A. Hadoop Distributed File System (HDFS)
B. MySQL
C. PostgreSQL
D. Oracle

3. What are the basic components of Hive-SQL? 答案：ABCD

A. SELECT statement
B. INSERT statement
C. DELETE statement
D. JOIN statement

4. Which of the following statements is used for selecting data from a table? 答案：C

A. CREATE TABLE
B. DROP TABLE
C. SELECT
D. INSERT

5. What is the purpose of the WHERE clause in a SELECT statement? 答案：A

A. To filter the rows based on conditions
B. To sort the rows in ascending order
C. To limit the number of rows returned
D. All of the above

6. Which of the following is not a basic SQL operator? 答案：B

A. SELECT
B. DROP
C. UPDATE
D. WHERE

7. Which of the following is used for inserting data into a table? 答案：C

A. CREATE TABLE
B. DROP TABLE
C. INSERT
D. UPDATE

8. Which of the following is used to delete data from a table? 答案：B

A. CREATE TABLE
B. DROP TABLE
C. INSERT
D. UPDATE

9. What is the purpose of the LIMIT clause in a SELECT statement? 答案：C

A. To filter the rows based on conditions
B. To sort the rows in ascending order
C. To limit the number of rows returned
D. All of the above

10. Which of the following is used to join two or more tables together? 答案：D

A. CREATE TABLE
B. DROP TABLE
C. INSERT
D. JOIN

11. What is a prerequisite for setting up a Hive-SQL environment? 答案：D

A. Installation of Hadoop
B. Installation of Hive
C. Installation of Sqoop
D. All of the above

12. Which of the following is NOT a component of Hive? 答案：D

A. Hive Server
B. Hive Client
C. Hive Metastore
D. MapReduce

13. What is the main component of the Hive-SQL environment? 答案：A

A. Hive Server
B. Hive Client
C. Hive Metastore
D. Hadoop Distributed File System (HDFS)

14. What is the role of the Hive Metastore in the Hive-SQL environment? 答案：D

A. Stores metadata about the schema and data in the HDFS
B. Provides a central repository for storing and retrieving data
C. Enforces data integrity and consistency
D. All of the above

15. What is the Hive Server that is running on in a Hive-SQL environment? 答案：B

A. Local server
B. Distributed server
C. Web server
D. Database server

16. What is the default port number for the Hive Server to listen on? 答案：A

A. 9000
B. 9090
C. 10000
D. 10090

17. What type of files can be stored in the Hive Distributed File System (HDFS)? 答案：A

A. Text files
B. Image files
C. Video files
D. All of the above

18. Which of the following is a recommended way to set up a Hive-SQL environment? 答案：B

A. Install Hadoop and Hive on the same machine
B. Install Hadoop and Hive on separate machines
C. Install Hive as a standalone application
D. All of the above

19. What is the name of the Hive Shell that comes bundled with Hive? 答案：A

A. Hive Shell
B. Hadoop Shell
C. MapReduce Shell
D. None of the above

20. Which of the following is a valid command to run in the Hive Shell? 答案：A

A. hive -h localhost -P 9090