SQLite Basics Quiz

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Questions and Answers

What is one reason SQLite is considered lightweight?

It only runs on specific operating systems.

It requires a large amount of system memory.

It requires extensive setup and configuration.

It can be easily integrated into embedded devices. (correct)

Which of the following statements about SQLite's data storage is correct?

SQLite never updates data in chunks; it rewrites the entire file.

SQLite always allocates the maximum column length specified.

SQLite is limited to fixed-length columns.

SQLite only allocates the necessary space based on the actual data length. (correct)

Which advantage of SQLite helps in preventing data loss during a power failure?

It backs up data to a remote server automatically.

It operates independently of power supply.

It continuously updates content, minimizing data loss. (correct)

It uses cloud storage for all databases.

Which of the following programming languages does SQLite provide API support for?

Visual Basic, C#, PHP, and Objective C. Signup and view all the answers

What is the primary reason for SQLite's performance being better than file systems?

SQLite loads only the necessary data, improving efficiency. Signup and view all the answers

What is required to start using SQLite on a computer?

Downloading SQLite libraries is enough. Signup and view all the answers

Which of the following describes the cross-platform nature of SQLite?

It works on multiple operating systems including mobile and embedded systems. Signup and view all the answers

What aspect of SQLite makes it user-friendly for beginners?

It requires no installation or configuration. Signup and view all the answers

What statement is used to remove a table and all its associated data in SQLite?

DROP TABLE Signup and view all the answers

What is the correct syntax to insert a record into a table in SQLite?

INSERT INTO TABLE_NAME [(column1, column2)] VALUES (value1, value2) Signup and view all the answers

Which command is used to retrieve data from a table in an SQLite database?

SELECT Signup and view all the answers

Which part of the UPDATE statement specifies which record to modify?

WHERE clause Signup and view all the answers

In SQLite, what does the DELETE query without a WHERE clause do?

Deletes all records from the table Signup and view all the answers

What does the syntax 'SELECT * FROM student;' do in an SQLite database?

Fetches all columns and records from the student table Signup and view all the answers

What is the purpose of using the WHERE clause in the DELETE statement?

To specify which rows to delete Signup and view all the answers

What will be the result of executing the statement 'Update student Set address="Althan" Where id=1;'?

Only the address of the student with ID 1 will change to Althan Signup and view all the answers

What does the DISTINCT operator do in a SQL query?

It fetches only unique records, eliminating duplicates. Signup and view all the answers

Which SQL statement correctly uses the BETWEEN operator?

SELECT * FROM EMPLOYEE WHERE EMP_ID BETWEEN 102 AND 105; Signup and view all the answers

How does the IN operator function in an SQL query?

It compares a value against a specified set of values. Signup and view all the answers

What is the purpose of the HAVING clause in a SQL query?

To limit results after aggregation. Signup and view all the answers

What does the UNION operator accomplish in SQL?

It combines the result sets of two or more SELECT statements and removes duplicates. Signup and view all the answers

Which of the following correctly describes the INTERSECT operator?

It finds common records from two or more tables. Signup and view all the answers

What would the following SQL statement return? SELECT * FROM EMPLOYEE WHERE EMP_ID NOT BETWEEN 102 AND 105;

Records with EMP_IDs less than 102 and greater than 105. Signup and view all the answers

Which of the following correctly demonstrates SQL syntax for the SELECT statement?

SELECT column_name FROM TABLE_NAME WHERE condition; Signup and view all the answers

What is the result of a CROSS JOIN between two tables with 10 and 5 rows respectively?

50 rows Signup and view all the answers

Which of the following is a valid syntax for a CROSS JOIN?

SELECT Columns FROM table1 CROSS JOIN table2; Signup and view all the answers

How does a Self Join operate in SQLite?

It joins a table to itself using aliases. Signup and view all the answers

What is the required component for the SQLite datetime function?

datetimestring Signup and view all the answers

What is the purpose of the datetime function in SQLite?

To format text into YYYY-MM-DD HH:MM:SS format. Signup and view all the answers

In a Self Join, which alias would you use to refer to the first instance of the same table?

x Signup and view all the answers

What does the WHERE clause accomplish in a Self Join query?

Specifies the relationship between the rows of the same table. Signup and view all the answers

Which of the following describes an output of a Self Join effectively?

It presents the original table with additional information related to itself. Signup and view all the answers

What is the purpose of the ROLLBACK command in relation to savepoints?

To undo all changes made after the specified savepoint. Signup and view all the answers

What happens to the table records when a ROLLBACK is executed to 'savepoint b'?

Only the record with value '3' is rolled back. Signup and view all the answers

What type of JOIN creates a new result table by combining column values of two tables based on a join-predicate?

Inner join Signup and view all the answers

Which of the following JOIN types includes all records from both tables, regardless of a match?

Outer join Signup and view all the answers

When using savepoints, what effect does the SAVEPOINT command have on a transaction?

Sets a point to which the transaction can later be rolled back. Signup and view all the answers

How many types of JOINS are mentioned as available in SQLite?

Four types of JOINS Signup and view all the answers

In what order should commands be used when manipulating records and setting savepoints?

BEGIN; SAVEPOINT; INSERT; ROLLBACK Signup and view all the answers

What will happen if you attempt to execute the ROLLBACK command without any defined savepoints?

An error will occur since no savepoints exist. Signup and view all the answers

Study Notes

SQLite Overview

SQLite requires no configuration or setup, making it easy to get started.
It is a cross-platform database management system (DBMS) compatible with various operating systems, including Windows, macOS, Linux, Unix, and embedded systems like Symbian and Windows CE.
Data storage is efficient, allowing variable-length columns that optimize space usage.

SQLite Features

Variable-length columns allow storing only necessary space for field data, enhancing efficiency.
A broad array of APIs is available for multiple programming languages, including .NET (C#, Visual Basic), PHP, Java, Objective C, and Python.
Written in ANSI-C, SQLite offers a simple and user-friendly API.

Advantages of SQLite

Lightweight and suitable as an embedded database in devices such as TVs, mobile phones, and cameras.
Provides fast reading and writing operations, significantly faster than a typical file system, with data loading on a need-to-know basis.
No installation required; simply download SQLite libraries to start creating databases.
Reliable with continuous updates to data to prevent loss during power failures or crashes.

Basic SQLite Commands

Create Table Example:
- CREATE TABLE STUDENT (ID INT PRIMARY KEY NOT NULL, NAME TEXT NOT NULL, AGE INT NOT NULL, ADDRESS CHAR(50), FEES REAL);
Drop Table Syntax:
- DROP TABLE database_name.table_name;
Insert Records:
- INSERT INTO TABLE_NAME (column1, column2) VALUES (value1, value2);
- Example: INSERT INTO student VALUES (1, "Heta Desai", 27, "Bhatar", 28999.50);

Data Retrieval and Manipulation

SELECT Statement:
- Used to fetch data: SELECT column1, column2 FROM table_name;
- Example: SELECT * FROM student;
UPDATE Statement:
- Modifies existing records with conditions: UPDATE table_name SET column1 = value1 WHERE [condition];
- Example: UPDATE student SET address = "Althan" WHERE id = 1;
DELETE Statement:
- Deletes records using conditions: DELETE FROM table_name WHERE [condition];

Filtering and Operators

DISTINCT Operator:
- Eliminates duplicate records: SELECT DISTINCT column1 FROM table_name;
IN Operator:
- Checks if a value matches any in a list: SELECT * FROM TABLE_NAME WHERE Column_name IN (value1, value2);
BETWEEN Operator:
- Retrieves values within a specified range: SELECT * FROM TABLE_NAME WHERE Column_name BETWEEN value1 AND value2;

Advanced SQL Operators

UNION Operator:
- Combines results from multiple SELECT statements while removing duplicates.
INTERSECT Operator:
- Returns common records from two or more SELECT statements.

Joins in SQLite

Joins combine records from two or more tables using common values.
Types of Joins:
- Inner Join: Combines rows from both tables that satisfy the join condition.
- Cross Join: Produces a Cartesian product of both tables.
- Self-Join: Joins a table with itself using aliases.

Example of Self-Join

Retrieve employee and manager details using a self-reference in the EMPLOYEE table:

Example Query:

SELECT x.emp_id, x.name AS Employee, y.emp_id AS 'Manager ID', y.name AS 'Manager Name'
FROM EMPLOYEE x, EMPLOYEE y
WHERE x.manage_id = y.emp_id;

SQLite Functions

datetime() Function:
- Translates a given string into a date and time format YYYY-MM-DD HH:MM:SS.
- Syntax: datetime(datetimestring, [modifier1, modifier2…]);

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Description

Test your knowledge of SQLite with this quiz! Covering its lightweight nature, data storage, advantages in data loss prevention, programming language support, and performance factors, this quiz provides a comprehensive overview of SQLite essentials.