Data Science & Machine Learning

Topic: Handling Datasets of All Types – Part 1 of 5: Introduction and Basic Concepts ☑️ 1. What is a Dataset? • A dataset is a structured collection of data, usually organized in rows and columns, used for analysis or training machine learning models. 2. Types of Datasets • Structured Data: Tables, spreadsheets with rows and columns (e.g., CSV, Excel). • Unstructured Data: Images, text, audio, video. • Semi-structured Data: JSON, XML files containing hierarchical data. 3. Common Dataset Formats • CSV (Comma-Separated Values) • Excel (.xls, .xlsx) • JSON (JavaScript Object Notation) • XML (eXtensible Markup Language) • Images (JPEG, PNG, TIFF) • Audio (WAV, MP3) 4. Loading Datasets in Python • Use libraries like pandas for structured data:

import pandas as pd
df = pd.read_csv('data.csv')

• Use libraries like json for JSON files:

import json
with open('data.json') as f:
    data = json.load(f)

5. Basic Dataset Exploration • Check shape and size:

print(df.shape)

• Preview data:

print(df.head())

• Check for missing values:

print(df.isnull().sum())

6. Summary • Understanding dataset types is crucial before processing. • Loading and exploring datasets helps identify cleaning and preprocessing needs. Exercise • Load a CSV and JSON dataset in Python, print their shapes, and identify missing values. #DataScience #Datasets #DataLoading #Python #DataExploration

Data Science vs. Data Analytics

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𝗦𝗤𝗟 𝗝𝗼𝗶𝗻𝘀 𝗖𝗵𝗲𝗮𝘁𝘀𝗵𝗲𝗲𝘁 - 𝗙𝘂𝗹𝗹𝘆 𝗘𝘅𝗽𝗹𝗮𝗶𝗻𝗲𝗱 𝗪𝗵𝘆 𝗷𝗼𝗶𝗻𝘀 𝗺𝗮𝘁𝘁𝗲𝗿? Joins let you combine data from multiple tables to extract meaningful insights. Every serious data analyst or backend dev should master these. Let’s break them down with clarity: 𝗜𝗡𝗡𝗘𝗥 𝗝𝗢𝗜𝗡 → Returns only the rows with matching keys in both tables → Think of it as intersection 𝗘𝘅𝗮𝗺𝗽𝗹𝗲: Customers who have placed at least one order SELECT * FROM Customers INNER JOIN Orders ON Customers.ID = Orders.CustomerID; 𝗟𝗘𝗙𝗧 𝗝𝗢𝗜𝗡 (𝗢𝗨𝗧𝗘𝗥) → Returns all rows from the left table + matching rows from the right → If no match, right side = NULL 𝗘𝘅𝗮𝗺𝗽𝗹𝗲: List all customers, even if they’ve never ordered SELECT * FROM Customers LEFT JOIN Orders ON Customers.ID = Orders.CustomerID; 𝗥𝗜𝗚𝗛𝗧 𝗝𝗢𝗜𝗡 (𝗢𝗨𝗧𝗘𝗥) → Returns all rows from the right table + matching rows from the left → Rarely used, but similar logic 𝗘𝘅𝗮𝗺𝗽𝗹𝗲: All orders, even from unknown or deleted customers SELECT * FROM Customers RIGHT JOIN Orders ON Customers.ID = Orders.CustomerID; 𝗙𝗨𝗟𝗟 𝗢𝗨𝗧𝗘𝗥 𝗝𝗢𝗜𝗡 → Returns all records when there’s a match in either table → Unmatched rows = NULLs 𝗘𝘅𝗮𝗺𝗽𝗹𝗲: Show all customers and all orders, whether matched or not SELECT * FROM Customers FULL OUTER JOIN Orders ON Customers.ID = Orders.CustomerID; 𝗖𝗥𝗢𝗦𝗦 𝗝𝗢𝗜𝗡 → Returns Cartesian product (all combinations) → Use with care. 1,000 x 1,000 rows = 1,000,000 results! 𝗘𝘅𝗮𝗺𝗽𝗹𝗲: Show all possible product and supplier pairings SELECT * FROM Products CROSS JOIN Suppliers; 𝗦𝗘𝗟𝗙 𝗝𝗢𝗜𝗡 → Join a table to itself → Used for hierarchical data like employees & managers 𝗘𝘅𝗮𝗺𝗽𝗹𝗲: Find each employee’s manager SELECT A.Name AS Employee, B.Name AS Manager FROM Employees A JOIN Employees B ON A.ManagerID = B.ID; 𝗕𝗲𝘀𝘁 𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗲𝘀 → Always use aliases (A, B) to simplify joins → Use JOIN ON instead of WHERE for better clarity → Test each join with LIMIT first to avoid surprises ---

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A-Z of Data Science Part-2

A-Z of Data Science Part-1