HSQLDB MCQs and Answers With Explanation – HSQLDB is a powerful relational database management system that offers many advanced features such as high-speed data retrieval, in-memory database support, and stored procedures and triggers. HSQLDB is written in Java, which makes it platform-independent and easy to integrate into Java-based applications. Aspirants preparing for the interviews to get their desired job can go through this article to gather the HSQLDB MCQs they may have a chance of appearing in the exam.
HSQLDB MCQs
In this article, we have compiled a list of the Top 50 HSQLDB Multiple Choice Questions to test your knowledge of this popular database system. The HSQLDB Multiple Choice Questions and Answers cover topics such as database modes, configuration parameters, data types, SQL commands, and system tables.
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HSQLDB Multiple Choice Questions and Answers
| Name | HSQLDB |
| Exam Type | MCQ (Multiple Choice Questions) |
| Category | Technical Quiz |
| Mode of Quiz | Online |
Top 50 HSQLDB MCQs | Practice Online Quiz
1. What does HSQLDB stand for?
a. Hyper Structured Query Language Database
b. High-Speed Query Language Database
c. Hyper SQL Database
d. High Structured Query Language Database
Answer: c. Hyper SQL Database
Explanation: HSQLDB stands for Hyper SQL Database, which is a relational database management system.
2. Which programming language is HSQLDB written in?
a. Java
b. Python
c. C++
d. Ruby
Answer: a. Java
Explanation: HSQLDB is written in Java, making it platform-independent and easy to integrate into Java-based applications.
3. Which of the following is not a feature of HSQLDB?
a. In-memory database support
b. High-speed data retrieval
c. Stored procedures and triggers
d. Object-oriented database capabilities
Answer: d. Object-oriented database capabilities
Explanation: While HSQLDB supports many advanced features, such as in-memory database support, stored procedures and triggers, and high-speed data retrieval, it is not an object-oriented database.
4. Which of the following is a valid JDBC URL for connecting to an HSQLDB database?
a. jdbc:mysql://localhost/mydb
b. jdbc:hsqldb://localhost/mydb
c. jdbc:oracle://localhost/mydb
d. jdbc:db2://localhost/mydb
Answer: b. jdbc:hsqldb://localhost/mydb
Explanation: The JDBC URL for connecting to an HSQLDB database is jdbc:hsqldb://localhost/mydb, where “localhost” is the name of the server hosting the database and “mydb” is the name of the database.
5. Which of the following is not a valid HSQLDB data type?
a. BIGINT
b. BOOLEAN
c. ENUM
d. VARCHAR
Answer: c. ENUM
Explanation: HSQLDB does not support the ENUM data type. However, it does support data types such as BIGINT, BOOLEAN, and VARCHAR.
6. Which of the following SQL commands is used to create a new table in HSQLDB?
a. INSERT
b. SELECT
c. UPDATE
d. CREATE
Answer: d. CREATE
Explanation: The CREATE SQL command is used to create a new table in HSQLDB.
7. Which of the following is an example of a HSQLDB aggregate function?
a. COUNT
b. INSERT
c. UPDATE
d. DELETE
Answer: a. COUNT
Explanation: The COUNT function is an example of a HSQLDB aggregate function, which is used to calculate a single value based on a set of input values.
8. Which of the following is a valid HSQLDB query to select all rows from a table named “customers”?
a. SELECT * FROM customers
b. SELECT all FROM customers
c. SELECT rows FROM customers
d. SELECT data FROM customers
Answer: a. SELECT * FROM customers
Explanation: The SELECT * FROM table_name SQL query is used to select all rows from a table named “customers” in HSQLDB.
9. Which of the following is a valid HSQLDB query to delete a row from a table named “customers” where the “id” field is equal to 5?
a. DELETE FROM customers WHERE id = 5
b. REMOVE FROM customers WHERE id = 5
c. DROP FROM customers WHERE id = 5
d. ERASE FROM customers WHERE id = 5
Answer: a. DELETE FROM customers WHERE id = 5
Explanation: The DELETE FROM table_name WHERE condition SQL query is used to delete rows from a table in HSQLDB. In this case, we want to delete a row from the “customers” table where the “id” field is equal to 5.
10. Which of the following is not a HSQLDB database mode?
a. Server mode
b. File mode
c. Embedded mode
d. Client mode
Answer: d. Client mode
Explanation: HSQLDB has three database modes: Server mode, File mode, and Embedded mode. There is no “Client mode” in HSQLDB.
11. Which of the following is a valid HSQLDB configuration parameter for setting the database username?
a. hsqldb.user
b. hsqldb.username
c. hsqldb.password
d. hsqldb.dbname
Answer: a. hsqldb.user
Explanation: The hsqldb.user configuration parameter is used to set the username for an HSQLDB database connection.
12. Which of the following is a valid HSQLDB configuration parameter for setting the maximum number of connections?
a. hsqldb.maxconns
b. hsqldb.maxconnections
c. hsqldb.maxconn
d. hsqldb.connections
Answer: b. hsqldb.maxconnections
Explanation: The hsqldb.maxconnections configuration parameter is used to set the maximum number of connections allowed for an HSQLDB database.
13. Which of the following is a valid HSQLDB configuration parameter for setting the database password?
a. hsqldb.user
b. hsqldb.username
c. hsqldb.password
d. hsqldb.dbname
Answer: c. hsqldb.password
Explanation: The hsqldb.password configuration parameter is used to set the password for an HSQLDB database connection.
14. Which of the following is not a HSQLDB system table?
a. SYSTEM_USERS
b. SYSTEM_INDEXINFO
c. SYSTEM_SEQUENCES
d. SYSTEM_TABLES
Answer: a. SYSTEM_USERS
Explanation: While HSQLDB does have several system tables, including SYSTEM_INDEXINFO, SYSTEM_SEQUENCES, and SYSTEM_TABLES, there is no SYSTEM_USERS table.
15. Which of the following is a valid HSQLDB system table for storing table and view metadata?
a. SYSTEM_USERS
b. SYSTEM_INDEXINFO
c. SYSTEM_SEQUENCES
d. SYSTEM_TABLES
Answer: d. SYSTEM_TABLES
Explanation: The SYSTEM_TABLES system table is used to store metadata about tables and views in an HSQLDB database.
16. Which of the following is a valid HSQLDB system table for storing sequence metadata?
a. SYSTEM_USERS
b. SYSTEM_INDEXINFO
c. SYSTEM_SEQUENCES
d. SYSTEM_TABLES
Answer: c. SYSTEM_SEQUENCES
Explanation: The SYSTEM_SEQUENCES system table is used to store metadata about sequences in an HSQLDB database.
17. Which of the following is a valid HSQLDB system table for storing index metadata?
a. SYSTEM_USERS
b. SYSTEM_INDEXINFO
c. SYSTEM_SEQUENCES
d. SYSTEM_TABLES
Answer: b. SYSTEM_INDEXINFO
Explanation: The SYSTEM_INDEXINFO system table is used to store metadata about indexes in an HSQLDB database. It contains information such as the name of the index, the name of the table it is associated with, and the columns that the index is built on.
18. Which of the following is a valid HSQLDB function for getting the current date?
a. CURDATE()
b. CURRENT_TIMESTAMP()
c. NOW()
d. SYSDATE()
Answer: a. CURDATE()
Explanation: The CURDATE() function is used to get the current date in an HSQLDB database.
19. Which of the following is a valid HSQLDB function for getting the current timestamp?
a. CURDATE()
b. CURRENT_TIMESTAMP()
c. NOW()
d. SYSDATE()
Answer: b. CURRENT_TIMESTAMP()
Explanation: The CURRENT_TIMESTAMP() function is used to get the current timestamp in an HSQLDB database.
20. Which of the following is a valid HSQLDB function for getting the current date and time?
a. CURDATE()
b. CURRENT_TIMESTAMP()
c. NOW()
d. SYSDATE()
Answer: c. NOW()
Explanation: The NOW() function is used to get the current date and time in an HSQLDB database.
21. Which of the following is a valid HSQLDB function for converting a string to a date?
a. TO_DATE()
b. CONVERT_TO_DATE()
c. CAST_TO_DATE()
d. STRING_TO_DATE()
Answer: a. TO_DATE()
Explanation: The TO_DATE() function is used to convert a string to a date in an HSQLDB database.
22. Which of the following is a valid HSQLDB function for converting a string to a timestamp?
a. TO_TIMESTAMP()
b. CONVERT_TO_TIMESTAMP()
c. CAST_TO_TIMESTAMP()
d. STRING_TO_TIMESTAMP()
Answer: a. TO_TIMESTAMP()
Explanation: The TO_TIMESTAMP() function is used to convert a string to a timestamp in an HSQLDB database.
23. Which of the following is a valid HSQLDB function for converting a string to a boolean?
a. TO_BOOL()
b. CONVERT_TO_BOOL()
c. CAST_TO_BOOL()
d. STRING_TO_BOOL()
Answer: a. TO_BOOL()
Explanation: The TO_BOOL() function is used to convert a string to a boolean value in an HSQLDB database.
24. Which of the following is a valid HSQLDB function for converting a string to an integer?
a. TO_INT()
b. CONVERT_TO_INT()
c. CAST_TO_INT()
d. STRING_TO_INT()
Answer: a. TO_INT()
Explanation: The TO_INT() function is used to convert a string to an integer value in an HSQLDB database.
25. Which of the following is a valid HSQLDB function for getting the length of a string?
a. LENGTH()
b. STRLEN()
c. STRING_LENGTH()
d. CHAR_LENGTH()
Answer: a. LENGTH()
Explanation: The LENGTH() function is used to get the length of a string in an HSQLDB database.
26. Which of the following is a valid HSQLDB function for converting a string to uppercase?
a. UPPER()
b. UCASE()
c. UPPER_CASE()
d. TO_UPPER()
Answer: a. UPPER()
Explanation: The UPPER() function is used to convert a string to uppercase in an HSQLDB database.
27. Which of the following is a valid HSQLDB function for converting a string to lowercase?
a. LOWER()
b. LCASE()
c. LOWER_CASE()
d. TO_LOWER()
Answer: a. LOWER()
Explanation: The LOWER() function is used to convert a string to lowercase in an HSQLDB database.
28. Which of the following is a valid HSQLDB function for concatenating strings?
a. CONCAT()
b. CONCATENATE()
c. JOIN()
d. STRING_CONCAT()
Answer: a. CONCAT()
Explanation: The CONCAT() function is used to concatenate strings in an HSQLDB database.
29. Which of the following is a valid HSQLDB function for trimming whitespace from the beginning and end of a string?
a. TRIM()
b. LTRIM()
c. RTRIM()
d. TRIM_WHITESPACE()
Answer: a. TRIM()
Explanation: The TRIM() function is used to trim whitespace from the beginning and end of a string in an HSQLDB database.
30. Which of the following is a valid HSQLDB function for rounding a number to the nearest integer?
a. ROUND()
b. FLOOR()
c. CEILING()
d. TRUNCATE()
Answer: a. ROUND()
Explanation: The ROUND() function is used to round a number to the nearest integer in an HSQLDB database.
31. Which of the following is a valid HSQLDB function for getting the absolute value of a number?
a. ABS()
b. VALUE()
c. MAGNITUDE()
d. ABSOLUTE()
Answer: a. ABS()
Explanation: The ABS() function is used to get the absolute value of a number in an HSQLDB database.
32. Which of the following is a valid HSQLDB function for getting the current date and time?
a. NOW()
b. CURRENT_DATE_TIME()
c. SYSDATE()
d. GET_DATE_TIME()
Answer: a. NOW()
Explanation: The NOW() function is used to get the current date and time in an HSQLDB database.
33. Which of the following is a valid HSQLDB function for getting the current date?
a. CURRENT_DATE()
b. NOW()
c. SYSDATE()
d. GET_DATE()
Answer: a. CURRENT_DATE()
Explanation: The CURRENT_DATE() function is used to get the current date in an HSQLDB database.
34. Which of the following is a valid HSQLDB function for getting the current time?
a. CURRENT_TIME()
b. NOW()
c. SYSTIME()
d. GET_TIME()
Answer: a. CURRENT_TIME()
Explanation: The CURRENT_TIME() function is used to get the current time in an HSQLDB database.
35. Which of the following is a valid HSQLDB data type for storing a date and time value?
a. TIMESTAMP
b. DATETIME
c. DATE
d. TIME
Answer: a. TIMESTAMP
Explanation: The TIMESTAMP data type is used to store a date and time value in an HSQLDB database.
36. Which of the following is a valid HSQLDB data type for storing a time value?
a. TIME
b. TIMESPAN
c. TIMEDURATION
d. TIMERANGE
Answer: a. TIME
Explanation: The TIME data type is used to store a time value in an HSQLDB database.
37. Which of the following is a valid HSQLDB data type for storing a boolean value?
a. BOOLEAN
b. BIT
c. BOOL
d. LOGICAL
Answer: a. BOOLEAN
Explanation: The BOOLEAN data type is used to store a boolean value in an HSQLDB database.
38. Which of the following is a valid HSQLDB data type for storing a large text value?
a. CLOB
b. TEXT
c. LONGVARCHAR
d. VARCHAR2
Answer: a. CLOB
Explanation: The CLOB data type is used to store a large text value in an HSQLDB database.
39. Which of the following is a valid HSQLDB data type for storing a large binary value?
a. BLOB
b. BINARY
c. VARBINARY
d. LONGVARBINARY
Answer: a. BLOB
Explanation: The BLOB data type is used to store a large binary value in an HSQLDB database.
40. What is the default isolation level in HSQLDB?
a. READ_UNCOMMITTED
b. READ_COMMITTED
c. REPEATABLE_READ
d. SERIALIZABLE
Answer: b. READ_COMMITTED
Explanation: The default isolation level in HSQLDB is READ_COMMITTED, which means that a transaction can only see changes committed by other transactions.
41. Which of the following is a valid HSQLDB command for creating a new table?
a. CREATE DATABASE
b. CREATE TABLE
c. CREATE SCHEMA
d. CREATE INDEX
Answer: b. CREATE TABLE
Explanation: The CREATE TABLE command is used to create a new table in an HSQLDB database.
42. Which of the following is a valid HSQLDB command for dropping a table?
a. DROP TABLE
b. DELETE TABLE
c. REMOVE TABLE
d. ERASE TABLE
Answer: a. DROP TABLE
Explanation: The DROP TABLE command is used to drop a table in an HSQLDB database.
43. Which of the following is a valid HSQLDB command for adding a new column to an existing table?
a. ALTER TABLE ADD COLUMN
b. MODIFY TABLE ADD COLUMN
c. UPDATE TABLE ADD COLUMN
d. CHANGE TABLE ADD COLUMN
Answer: a. ALTER TABLE ADD COLUMN
Explanation: The ALTER TABLE ADD COLUMN command is used to add a new column to an existing table in an HSQLDB database.
44. Which of the following is a valid HSQLDB command for modifying an existing column in a table?
a. ALTER TABLE MODIFY COLUMN
b. ALTER TABLE CHANGE COLUMN
c. MODIFY TABLE ALTER COLUMN
d. CHANGE TABLE MODIFY COLUMN
Answer: b. ALTER TABLE CHANGE COLUMN
Explanation: The ALTER TABLE CHANGE COLUMN command is used to modify an existing column in a table in an HSQLDB database.
45. Which of the following is a valid HSQLDB command for deleting data from a table?
a. DELETE FROM
b. TRUNCATE
c. DROP TABLE
d. ERASE
Answer: a. DELETE FROM
Explanation: The DELETE FROM command is used to delete data from a table in an HSQLDB database.
46. Which of the following is a valid HSQLDB command for updating data in a table?
a. UPDATE
b. MODIFY
c. REPLACE
d. CHANGE
Answer: a. UPDATE
Explanation: The UPDATE command is used to update data in a table in an HSQLDB database.
47. Which of the following is a valid HSQLDB command for creating a new index?
a. CREATE INDEX
b. CREATE KEY
c. CREATE CONSTRAINT
d. CREATE UNIQUE
Answer: a. CREATE INDEX
Explanation: The CREATE INDEX command is used to create a new index in an HSQLDB database.
48. Which of the following is a valid HSQLDB command for dropping an index?
a. DROP INDEX
b. DROP KEY
c. DROP CONSTRAINT
d. DROP UNIQUE
Answer: a. DROP INDEX
Explanation: The DROP INDEX command is used to drop an index in an HSQLDB database.
49. Which of the following is a valid HSQLDB command for backing up a database?
a. BACKUP DATABASE
b. COPY DATABASE
c. EXPORT DATABASE
d. SAVE DATABASE
Answer: a. BACKUP DATABASE
Explanation: The BACKUP DATABASE command is used to backup a database in an HSQLDB database.
50. Which of the following statements about HSQLDB data types is true?
a. HSQLDB supports only a limited set of data types.
b. HSQLDB supports a wide range of data types.
c. HSQLDB supports only numeric data types.
d. HSQLDB does not support data types.
Answer: b. HSQLDB supports a wide range of data types.
Explanation: HSQLDB supports a wide range of data types, including numeric, character, date/ time, and binary data types. Numeric data types include integers, decimals, and floating-point numbers. Character data types include strings and character arrays. Date/ time data types include date, time, and timestamp data. Binary data types include BLOBs and CLOBs. HSQLDB also supports user-defined data types.
HSQLDB is a powerful and reliable database management system that offers various features such as high performance, portability, and support for multiple programming languages. And these HSQLDB MCQs/ HSQLDB Quiz will help you in enhancing your knowledge about the HSQLDB. In order to not miss any updates on technical quizzess of various concepts keep following our portal Freshersnow in your free time.