Data Analytics & AI | SQL Interviews | Power BI Resources
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๐Ÿ”“Explore the fascinating world of Data Analytics & Artificial Intelligence

๐Ÿ’ป Best AI tools, free resources, and expert advice to land your dream tech job.

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๐Ÿšจ Google to implement AI for age verification

Google is introducing an AI-powered age verification system across its services, including YouTube, to better enforce age restrictions. This machine learning model will assess whether users are above or below 18 years old to ensure appropriate content filtering.

The initiative comes in response to increasing regulatory demands for enhanced child safety online and is part of Google's wider strategy to embed AI technologies throughout its platforms. The rollout will initially target key markets, with plans for a global expansion in the future.
Data Analytics Roadmap
|
|-- Fundamentals
|   |-- Mathematics
|   |   |-- Descriptive Statistics
|   |   |-- Inferential Statistics
|   |   |-- Probability Theory
|   |
|   |-- Programming
|   |   |-- Python (Focus on Libraries like Pandas, NumPy)
|   |   |-- R (For Statistical Analysis)
|   |   |-- SQL (For Data Extraction)
|
|-- Data Collection and Storage
|   |-- Data Sources
|   |   |-- APIs
|   |   |-- Web Scraping
|   |   |-- Databases
|   |
|   |-- Data Storage
|   |   |-- Relational Databases (MySQL, PostgreSQL)
|   |   |-- NoSQL Databases (MongoDB, Cassandra)
|   |   |-- Data Lakes and Warehousing (Snowflake, Redshift)
|
|-- Data Cleaning and Preparation
|   |-- Handling Missing Data
|   |-- Data Transformation
|   |-- Data Normalization and Standardization
|   |-- Outlier Detection
|
|-- Exploratory Data Analysis (EDA)
|   |-- Data Visualization Tools
|   |   |-- Matplotlib
|   |   |-- Seaborn
|   |   |-- ggplot2
|   |
|   |-- Identifying Trends and Patterns
|   |-- Correlation Analysis
|
|-- Advanced Analytics
|   |-- Predictive Analytics (Regression, Forecasting)
|   |-- Prescriptive Analytics (Optimization Models)
|   |-- Segmentation (Clustering Techniques)
|   |-- Sentiment Analysis (Text Data)
|
|-- Data Visualization and Reporting
|   |-- Visualization Tools
|   |   |-- Power BI
|   |   |-- Tableau
|   |   |-- Google Data Studio
|   |
|   |-- Dashboard Design
|   |-- Interactive Visualizations
|   |-- Storytelling with Data
|
|-- Business Intelligence (BI)
|   |-- KPI Design and Implementation
|   |-- Decision-Making Frameworks
|   |-- Industry-Specific Use Cases (Finance, Marketing, HR)
|
|-- Big Data Analytics
|   |-- Tools and Frameworks
|   |   |-- Hadoop
|   |   |-- Apache Spark
|   |
|   |-- Real-Time Data Processing
|   |-- Stream Analytics (Kafka, Flink)
|
|-- Domain Knowledge
|   |-- Industry Applications
|   |   |-- E-commerce
|   |   |-- Healthcare
|   |   |-- Supply Chain
|
|-- Ethical Data Usage
|   |-- Data Privacy Regulations (GDPR, CCPA)
|   |-- Bias Mitigation in Analysis
|   |-- Transparency in Reporting

Free Resources to learn Data Analytics skills๐Ÿ‘‡๐Ÿ‘‡

1. SQL

https://mode.com/sql-tutorial/introduction-to-sql

https://t.iss.one/sqlspecialist/738

2. Python

https://www.learnpython.org/

https://t.iss.one/pythondevelopersindia/873

https://bit.ly/3T7y4ta

https://www.geeksforgeeks.org/python-programming-language/learn-python-tutorial

3. R

https://datacamp.pxf.io/vPyB4L

4. Data Structures

https://leetcode.com/study-plan/data-structure/

https://www.udacity.com/course/data-structures-and-algorithms-in-python--ud513

5. Data Visualization

https://www.freecodecamp.org/learn/data-visualization/

https://t.iss.one/Data_Visual/2

https://www.tableau.com/learn/training/20223

https://www.workout-wednesday.com/power-bi-challenges/

6. Excel

https://excel-practice-online.com/

https://t.iss.one/excel_data

https://www.w3schools.com/EXCEL/index.php

Join @free4unow_backup for more free courses

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ENJOY LEARNING ๐Ÿ‘๐Ÿ‘
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Forwarded from SQL For Data Analytics
Advanced SQL Optimization Tips for Data Analysts

1. Use Proper Indexing
Create indexes on frequently queried columns to speed up data retrieval.

2. Avoid `SELECT *`
Specify only the columns you need to reduce the amount of data processed.

3. Use `WHERE` Instead of `HAVING`
Filter your data as early as possible in the query to optimize performance.

4. Limit Joins
Try to keep joins to a minimum to reduce query complexity and processing time.

5. Apply `LIMIT` or `TOP`
Retrieve only the required rows to save on resources.

6. Optimize Joins
Use INNER JOIN instead of OUTER JOIN whenever possible.

7. Use Temporary Tables
Break large, complex queries into smaller parts using temporary tables.

8. Avoid Functions on Indexed Columns
Using functions on indexed columns often prevents the index from being used.

9. Use CTEs for Readability
Common Table Expressions help simplify nested queries and improve clarity.

10. Analyze Execution Plans
Leverage execution plans to identify bottlenecks and make targeted optimizations.

Happy querying!
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โŒจ๏ธ Benefits of learning Python Programming

1. Web Development: Python frameworks like Django and Flask are popular for building dynamic websites and web applications.

2. Data Analysis: Python has powerful libraries like Pandas and NumPy for data manipulation and analysis, making it widely used in data science and analytic.

3. Machine Learning: Python's libraries such as TensorFlow, Keras, and Scikit-learn are extensively used for implementing machine learning algorithms and building predictive models.

4. Artificial Intelligence: Python is commonly used in AI development due to its simplicity and extensive libraries for tasks like natural language processing, image recognition, and neural network implementation.

5. Cybersecurity: Python is utilized for tasks such as penetration testing, network scanning, and creating security tools due to its versatility and ease of use.

6. Game Development: Python, along with libraries like Pygame, is used for developing games, prototyping game mechanics, and creating game scripts.

7. Automation: Python's simplicity and versatility make it ideal for automating repetitive tasks, such as scripting, data scraping, and process automation.
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๐‡๐จ๐ฐ ๐ญ๐จ ๐ข๐ฆ๐ฉ๐ซ๐จ๐ฏ๐ž ๐๐š๐ญ๐š๐›๐š๐ฌ๐ž ๐ฉ๐ž๐ซ๐Ÿ๐จ๐ซ๐ฆ๐š๐ง๐œ๐ž?

Here are some of the top ways to improve database performance:

1. Indexing
Create the right indexes based on query patterns to speed up data retrieval.

2. Materialized Views
Store pre-computed query results for quick access, reducing the need to process complex queries repeatedly.

3. Vertical Scaling
Increase the capacity of the hashtag#database server by adding more CPU, RAM, or storage.
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Old AI models are losing their mindsโ€” Literally

Scientists gave AI chatbots a real human dementia test (the MoCA), and guess what? The older ones basically drooled on the exam. ChatGPT-4 barely passed with a 26/30, but Gemini 1.0 scored a tragic 16โ€”worse than your sleep-deprived grandpa.

Turns out, AI struggles with visual/spatial tasks, executive function, and, uhโ€ฆ remembering things. So if an AI tells you itโ€™s โ€œ99% sureโ€ you have the plague, maybe get a second opinionโ€”from an actual doctor.
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How to start your career in data analysis for freshers ๐Ÿ˜„๐Ÿ‘‡

1. Learn the Basics: Begin with understanding the fundamental concepts of statistics, mathematics, and programming languages like Python or R.

Free Resources: https://t.iss.one/pythonanalyst/103

2. Acquire Technical Skills: Develop proficiency in data analysis tools such as Excel, SQL, and data visualization tools like Tableau or Power BI.

Free Data Analysis Books: https://t.iss.one/learndataanalysis

3. Gain Knowledge in Statistics: A solid foundation in statistical concepts is crucial for data analysis. Learn about probability, hypothesis testing, and regression analysis.
Free course by Khan Academy will help you to enhance these skills.

4. Programming Proficiency: Enhance your programming skills, especially in languages commonly used in data analysis like Python or R. Familiarity with libraries such as Pandas and NumPy in Python is beneficial. Kaggle has amazing content to learn these skills.

5. Data Cleaning and Preprocessing: Understand the importance of cleaning and preprocessing data. Learn techniques to handle missing values, outliers, and transform data for analysis.

6. Database Knowledge: Acquire knowledge about databases and SQL for efficient data retrieval and manipulation.
SQL for data analytics: https://t.iss.one/sqlanalyst

7. Data Visualization: Master the art of presenting insights through visualizations. Learn tools like Matplotlib, Seaborn, or ggplot2 for creating meaningful charts and graphs. If you are from non-technical background, learn Tableau or Power BI.
FREE Resources to learn data visualization: https://t.iss.one/PowerBI_analyst

8. Machine Learning Basics: Familiarize yourself with basic machine learning concepts. This knowledge can be beneficial for advanced analytics tasks.
ML Basics: https://t.iss.one/datasciencefun/1476

9. Build a Portfolio: Work on projects that showcase your skills. This could be personal projects, contributions to open-source projects, or challenges from platforms like Kaggle.
Data Analytics Portfolio Projects: https://t.iss.one/DataPortfolio

10. Networking and Continuous Learning: Engage with the data science community, attend meetups, webinars, and conferences. Build your strong Linkedin profile and enhance your network.

11. Apply for Internships or Entry-Level Positions: Gain practical experience by applying for internships or entry-level positions in data analysis. Real-world projects contribute significantly to your learning.
Data Analyst Jobs & Internship opportunities: https://t.iss.one/jobs_SQL

12. Effective Communication: Develop strong communication skills. Being able to convey your findings and insights in a clear and understandable manner is crucial.

Share with credits: https://t.iss.one/sqlspecialist

Hope it helps :)
Top 5 Tools to master Data Analytics

1. Python:
- Versatile programming language.
- Offers powerful libraries like Pandas, NumPy, and Scikit-learn.
- Used for data manipulation, analysis, and machine learning tasks.

2. R:
- Statistical programming language.
- Provides extensive statistical capabilities.
- Popular for data analysis in academia.
- Offers visualization libraries like ggplot2.

3. SQL (Structured Query Language):
- Essential for working with relational databases.
- Allows querying, manipulation, and management of data.
- Standard language for database management systems.

4. Tableau:
- Data visualization tool.
- Enables creation of interactive dashboards.
- Helps in communicating insights effectively.
- Widely used in business intelligence.

5. Apache Spark:
- Framework for large-scale data processing.
- Offers distributed computing capabilities.
- Libraries like Spark SQL and MLlib for data manipulation and machine learning.
- Ideal for processing big data efficiently.
๐’๐ข๐ฆ๐ฉ๐ฅ๐ž ๐†๐ฎ๐ข๐๐ž ๐ญ๐จ ๐‹๐ž๐š๐ซ๐ง ๐Œ๐š๐œ๐ก๐ข๐ง๐ž ๐‹๐ž๐š๐ซ๐ง๐ข๐ง๐  ๐Ÿ๐จ๐ซ ๐ƒ๐š๐ญ๐š ๐€๐ง๐š๐ฅ๐ฒ๐ญ๐ข๐œ๐ฌ ๐Ÿ˜ƒ

๐Ÿ™„ ๐–๐ก๐š๐ญ ๐ข๐ฌ ๐Œ๐š๐œ๐ก๐ข๐ง๐ž ๐‹๐ž๐š๐ซ๐ง๐ข๐ง๐ ?
Imagine you're teaching a child to recognize fruits. You show them an apple, tell them itโ€™s an apple, and next time they know it. Thatโ€™s what Machine Learning does! But instead of a child, itโ€™s a computer, and instead of fruits, it learns from data.
Machine Learning is about teaching computers to learn from past data so they can make smart decisions or predictions on their own, improving over time without needing new instructions.

๐Ÿค” ๐–๐ก๐ฒ ๐ข๐ฌ ๐Œ๐š๐œ๐ก๐ข๐ง๐ž ๐‹๐ž๐š๐ซ๐ง๐ข๐ง๐  ๐ˆ๐ฆ๐ฉ๐จ๐ซ๐ญ๐š๐ง๐ญ ๐Ÿ๐จ๐ซ ๐ƒ๐š๐ญ๐š ๐€๐ง๐š๐ฅ๐ฒ๐ญ๐ข๐œ๐ฌ?

Machine Learning makes data analytics super powerful. Instead of just looking at past data, it can help predict future trends, find patterns we didnโ€™t notice, and make decisions that help businesses grow!

๐Ÿ˜ฎ ๐‡๐จ๐ฐ ๐ญ๐จ ๐‹๐ž๐š๐ซ๐ง ๐Œ๐š๐œ๐ก๐ข๐ง๐ž ๐‹๐ž๐š๐ซ๐ง๐ข๐ง๐  ๐Ÿ๐จ๐ซ ๐ƒ๐š๐ญ๐š ๐€๐ง๐š๐ฅ๐ฒ๐ญ๐ข๐œ๐ฌ?

โœ… ๐‹๐ž๐š๐ซ๐ง ๐๐ฒ๐ญ๐ก๐จ๐ง: Python is the most commonly used language in ML. Start by getting comfortable with basic Python, then move on to ML-specific libraries like:
๐ฉ๐š๐ง๐๐š๐ฌ: For data manipulation.
๐๐ฎ๐ฆ๐๐ฒ: For numerical calculations.
๐ฌ๐œ๐ข๐ค๐ข๐ญ-๐ฅ๐ž๐š๐ซ๐ง: For implementing basic ML algorithms.

โœ… ๐”๐ง๐๐ž๐ซ๐ฌ๐ญ๐š๐ง๐ ๐ญ๐ก๐ž ๐๐š๐ฌ๐ข๐œ๐ฌ ๐จ๐Ÿ ๐’๐ญ๐š๐ญ๐ข๐ฌ๐ญ๐ข๐œ๐ฌ: ML relies heavily on concepts like probability, distributions, and hypothesis testing. Understanding basic statistics will help you grasp how models work.

โœ… ๐๐ซ๐š๐œ๐ญ๐ข๐œ๐ž ๐จ๐ง ๐‘๐ž๐š๐ฅ ๐ƒ๐š๐ญ๐š๐ฌ๐ž๐ญ๐ฌ: Platforms like Kaggle offer datasets and ML competitions. Start by analyzing small datasets to understand how machine learning models make predictions.

โœ… ๐‹๐ž๐š๐ซ๐ง ๐•๐ข๐ฌ๐ฎ๐š๐ฅ๐ข๐ณ๐š๐ญ๐ข๐จ๐ง: Use tools like Matplotlib or Seaborn to visualize data. This will help you understand patterns in the data and how machine learning models interpret them.

โœ… ๐–๐จ๐ซ๐ค ๐จ๐ง ๐’๐ข๐ฆ๐ฉ๐ฅ๐ž ๐๐ซ๐จ๐ฃ๐ž๐œ๐ญ๐ฌ: Start with basic ML projects such as:
-Predicting house prices.
-Classifying emails as spam or not spam.
-Clustering customers based on their purchasing habits.

I have curated the best interview resources to crack Data Science Interviews
๐Ÿ‘‡๐Ÿ‘‡
https://whatsapp.com/channel/0029VaGgzAk72WTmQFERKh02

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