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?

Python will open a new database file with the specified name Signup and view all the answers

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

To manipulate data in the database efficiently Signup and view all the answers

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

connect() Signup and view all the answers

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

It executes SQL statements Signup and view all the answers

Which statement accurately describes the nature of SQLite?

It is a simple relational database system Signup and view all the answers

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

To traverse and fetch records from the database. Signup and view all the answers

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

Commit Signup and view all the answers

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

connection = sqlite3.connect('Academy.db') Signup and view all the answers

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

Execute SQL commands to insert data. Signup and view all the answers

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

It creates a new database named Academy. Signup and view all the answers

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

Send an email to the database administrator. Signup and view all the answers

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

cursor.execute() Signup and view all the answers

What is the effect of the command 'sql_comm =

It assigns an SQL command as a string to the variable sql_comm. Signup and view all the answers

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

INTEGER Signup and view all the answers

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

To fetch the results from a query Signup and view all the answers

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

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

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

It makes Rollno a unique identifier for records Signup and view all the answers

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

DECIMAL(5, 2) Signup and view all the answers

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

To allow inclusion of multi-line strings Signup and view all the answers

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

A cursor Signup and view all the answers

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

A string value limited to one character Signup and view all the answers

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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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.