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?

    <p>Visual Basic, C#, PHP, and Objective C.</p> Signup and view all the answers

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

    <p>SQLite loads only the necessary data, improving efficiency.</p> Signup and view all the answers

    What is required to start using SQLite on a computer?

    <p>Downloading SQLite libraries is enough.</p> Signup and view all the answers

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

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

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

    <p>It requires no installation or configuration.</p> Signup and view all the answers

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

    <p>DROP TABLE</p> Signup and view all the answers

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

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

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

    <p>SELECT</p> Signup and view all the answers

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

    <p>WHERE clause</p> Signup and view all the answers

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

    <p>Deletes all records from the table</p> Signup and view all the answers

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

    <p>Fetches all columns and records from the student table</p> Signup and view all the answers

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

    <p>To specify which rows to delete</p> Signup and view all the answers

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

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

    What does the DISTINCT operator do in a SQL query?

    <p>It fetches only unique records, eliminating duplicates.</p> Signup and view all the answers

    Which SQL statement correctly uses the BETWEEN operator?

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

    How does the IN operator function in an SQL query?

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

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

    <p>To limit results after aggregation.</p> Signup and view all the answers

    What does the UNION operator accomplish in SQL?

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

    Which of the following correctly describes the INTERSECT operator?

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

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

    <p>Records with EMP_IDs less than 102 and greater than 105.</p> Signup and view all the answers

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

    <p>SELECT column_name FROM TABLE_NAME WHERE condition;</p> Signup and view all the answers

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

    <p>50 rows</p> Signup and view all the answers

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

    <p>SELECT Columns FROM table1 CROSS JOIN table2;</p> Signup and view all the answers

    How does a Self Join operate in SQLite?

    <p>It joins a table to itself using aliases.</p> Signup and view all the answers

    What is the required component for the SQLite datetime function?

    <p>datetimestring</p> Signup and view all the answers

    What is the purpose of the datetime function in SQLite?

    <p>To format text into YYYY-MM-DD HH:MM:SS format.</p> 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?

    <p>x</p> Signup and view all the answers

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

    <p>Specifies the relationship between the rows of the same table.</p> Signup and view all the answers

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

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

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

    <p>To undo all changes made after the specified savepoint.</p> Signup and view all the answers

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

    <p>Only the record with value '3' is rolled back.</p> 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?

    <p>Inner join</p> Signup and view all the answers

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

    <p>Outer join</p> Signup and view all the answers

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

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

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

    <p>Four types of JOINS</p> Signup and view all the answers

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

    <p>BEGIN; SAVEPOINT; INSERT; ROLLBACK</p> Signup and view all the answers

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

    <p>An error will occur since no savepoints exist.</p> 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.

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