Data Manipulation with SQL and SQLite
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Questions and Answers

What does a database management system facilitate?

  • Encryption of user passwords within the database
  • Storage of data only on external servers
  • Direct interaction between users and databases (correct)
  • Automatic data backup without user input

What is a primary advantage of using SQLite over MySQL or Oracle?

  • SQLite stores data as complex objects
  • SQLite supports multi-user access natively
  • SQLite is designed to be embedded in applications (correct)
  • SQLite uses a server-client model for connections

In which step of using SQLite must you set the cursor object?

  • Step 2
  • Step 3 (correct)
  • Step 4
  • Step 1

What happens if you attempt to connect to a database that does not exist in SQLite?

<p>Python will open a new database file with the specified name (D)</p> Signup and view all the answers

What is the primary purpose of the Python script mentioned in the learning objectives?

<p>To manipulate data in the database efficiently (D)</p> Signup and view all the answers

Which method is used to establish a connection to the SQLite database in Python?

<p>connect() (D)</p> Signup and view all the answers

What role does the cursor object play in a database interaction?

<p>It executes SQL statements (D)</p> Signup and view all the answers

Which statement accurately describes the nature of SQLite?

<p>It is a simple relational database system (D)</p> Signup and view all the answers

What is the primary purpose of a cursor in database operations?

<p>To traverse and fetch records from the database. (B)</p> Signup and view all the answers

Which command is used to save changes made to the records in a database?

<p>Commit (C)</p> Signup and view all the answers

Which line of code is used to connect to an existing SQLite database in Python?

<p>connection = sqlite3.connect('Academy.db') (B)</p> Signup and view all the answers

What should be done after creating a table in a database?

<p>Execute SQL commands to insert data. (C)</p> Signup and view all the answers

What does the command 'CREATE DATABASE Academy;' do in SQL?

<p>It creates a new database named Academy. (B)</p> Signup and view all the answers

Which of the following is NOT a step to create a new table in SQLite using Python?

<p>Send an email to the database administrator. (D)</p> Signup and view all the answers

To execute an SQL command after assigning it to a variable, which method must be called?

<p>cursor.execute() (D)</p> Signup and view all the answers

What is the effect of the command 'sql_comm =

<p>It assigns an SQL command as a string to the variable sql_comm. (C)</p> Signup and view all the answers

What SQL data type is used for the 'Rollno' field in the 'Student' table?

<p>INTEGER (B)</p> Signup and view all the answers

What is the purpose of the cursor object in SQL operations?

<p>To fetch the results from a query (B)</p> Signup and view all the answers

Which of the following SQL statements correctly creates the 'Student' table?

<p>CREATE TABLE Student (Rollno INTEGER PRIMARY KEY, Sname VARCHAR(20), Grade CHAR(1), gender CHAR(1), birth_date DATE); (A)</p> Signup and view all the answers

What does the 'PRIMARY KEY' constraint signify for the 'Rollno' field?

<p>It makes Rollno a unique identifier for records (D)</p> Signup and view all the answers

In the SQL command provided, which data type is used for the average student grades?

<p>DECIMAL(5, 2) (A)</p> Signup and view all the answers

What is the significance of using triple quotes in the SQL command string in Python?

<p>To allow inclusion of multi-line strings (A)</p> Signup and view all the answers

Which statement correctly identifies the data structure used to hold the list of records from a database?

<p>A cursor (D)</p> Signup and view all the answers

What does the 'gender' field in the 'Student' table represent?

<p>A string value limited to one character (B)</p> Signup and view all the answers

Flashcards

SQLite

A simple, file-based relational database management system that is embedded in applications, meaning it doesn't need a separate server program.

Database Connection

Establishes a link between your Python program and the desired SQLite database file, allowing your program to interact with it.

Cursor Object

A pointer to a specific location within the database, used for managing data operations like retrieving, inserting, updating, or deleting.

Database

An organized repository of data, which can either refer to the data itself or the system managing it.

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Database Management System (DBMS)

Software designed to manage the interaction between users (programs or people) and databases.

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connect() Method

A method within the SQLite library used to create a connection to an existing database or to establish a new database file using the provided file name.

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Interacting with an SQL database

The process of interacting with a database using Python, such as adding, updating, deleting, or retrieving data.

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SQL (Structured Query Language)

A text-based language used to communicate with database management systems for data manipulation.

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Cursor

A control structure used to navigate and retrieve records from a database in Python. It allows you to execute SQL commands to interact with the database.

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sqlite3 module

A Python module that provides an interface to interact with SQLite databases. It allows you to create, connect, and interact with database tables.

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Commit

A command used to commit any changes made to the database. Without committing, changes are not permanently saved.

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Connecting to a database

The process of establishing a connection between your Python code and an SQLite database. This allows you to interact with the database.

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Table

A structured data element within a database that holds related information, organized into rows and columns. Each table represents a specific entity, like a list of customers or products.

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'.db'

A file extension used for SQLite databases. It typically stores the database data and schema.

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CREATE TABLE

A command used to create a new table within an existing database. It defines the structure and columns of the table.

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CREATE TABLE Statement

The SQL syntax to create a new table within a database. It defines the name of the table, the columns it contains, their data types, and any special properties like primary keys.

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Primary Key

A specific column in a table that has a unique and non-repeating value for each row. It acts as the primary identifier for each record.

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VARCHAR

A data type used in SQL to store text values of various lengths. The VARCHAR data type allows you to store text strings of up to a specified maximum length.

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SQL Command

The command used in SQL to execute a predefined script or command, often used to create tables, add data, or modify data.

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DECIMAL

A special data type in SQL designed to store numeric values with a fixed precision, typically used for storing decimal numbers with a set number of digits before and after the decimal point.

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CHAR

A data type used in SQL to store a single character, often used for storing a single letter.

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Study Notes

Data Manipulation Through SQL

  • Python scripts can create tables, add/delete rows, and query tables in a database.
  • A database is an organized collection of data. A database management system (DBMS) is application software.
  • SQLite is a relational database system that stores data in regular files. It's designed for embedding in apps.
  • SQLite is fast, reliable, and easy to use in Python.

SQLite Usage

  • Import the sqlite3 library.
  • Create a connection to the database using connect() method, providing the filename.
  • Create a cursor object using cursor().
  • Execute SQL commands like creating a table, inserting data, updating, or deleting.

Creating a Database

  • sqlite3.connect("database_name.db") creates the database.
  • If the database exists, the connection opens it. Otherwise, a new database file is created.

Creating a Table

  • The CREATE TABLE statement defines the table structure.
  • Columns have their datatypes (e.g., INTEGER, VARCHAR, DATE).
  • Specify primary keys to uniquely identify rows (e.g., PRIMARY KEY (Rollno)).

Adding Records

  • The INSERT statement adds new rows to a table.
  • execute() method runs SQL commands.

Retrieving Data

  • Use SELECT to retrieve data from specific columns.

Updating Data

  • UPDATE statement changes existing rows' column values.

Deleting Data

  • DELETE statement removes rows from a table.

Committing Changes

  • Database changes aren't saved until you commit.

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Data Manipulation Through SQL PDF

Description

This quiz covers the fundamental concepts of data manipulation using SQL in Python, specifically with SQLite. Topics include creating databases, executing SQL commands, and managing data with the sqlite3 library. Ideal for beginners looking to enhance their database management skills.

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