Important Python Functions

✅ 𝐇𝐨𝐰 𝐭𝐨 𝐁𝐮𝐢𝐥𝐝 𝐚 𝐂𝐚𝐫𝐞𝐞𝐫 𝐚𝐬 𝐚 𝐃𝐚𝐭𝐚 𝐀𝐧𝐚𝐥𝐲𝐬𝐭 𝐢𝐧 𝟐𝟎𝟐𝟓 🧑‍💻

If you are thinking about becoming a data analyst, 2025 is the perfect year to start. Companies need people who can understand data and turn it into useful insights. Here’s a simple step-by-step guide to help you start your journey.

𝟏. 𝐃𝐚𝐭𝐚 𝐀𝐧𝐚𝐥𝐲𝐬𝐭 𝐑𝐨𝐥𝐞
A data analyst collects and studies data to help companies make better decisions. They find trends, create reports, and suggest solutions to business problems.

𝟐. 𝐋𝐞𝐚𝐫𝐧 𝐍𝐞𝐜𝐞𝐬𝐬𝐚𝐫𝐲 𝐒𝐤𝐢𝐥𝐥𝐬
𝐄𝐱𝐜𝐞𝐥: Start with PivotTables, VLOOKUP, and creating dashboards.
𝐒𝐐𝐋: Master queries to extract and manipulate data.
𝐃𝐚𝐭𝐚 𝐕𝐢𝐬𝐮𝐚𝐥𝐢𝐳𝐚𝐭𝐢𝐨𝐧 𝐓𝐨𝐨𝐥𝐬: Learn Power BI and Tableau to present insights effectively.
𝐏𝐲𝐭𝐡𝐨𝐧: Focus on libraries like Pandas, NumPy, Matplotlib, and Seaborn.
𝐒𝐭𝐚𝐭𝐢𝐬𝐭𝐢𝐜𝐬: Basic concepts- mean, median, mode, standard deviation, regression.

𝟑. 𝐖𝐨𝐫𝐤 𝐨𝐧 𝐏𝐫𝐨𝐣𝐞𝐜𝐭𝐬
https://t.iss.one/sqlproject
https://t.iss.one/pythonspecialist

𝟒. 𝐆𝐚𝐢𝐧 𝐂𝐞𝐫𝐭𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧
Certifications add credibility to your resume. Some popular ones include:
Google Data Analytics Professional Certificate
Microsoft Certified: Data Analyst Associate
Tableau Desktop Specialist Certification

𝟓. 𝐂𝐫𝐞𝐚𝐭𝐞 𝐏𝐨𝐫𝐭𝐟𝐨𝐥𝐢𝐨
𝐋𝐢𝐧𝐤𝐞𝐝𝐈𝐧: Treat your LinkedIn profile as your portfolio. Update it with skills, certifications, and projects.
𝐆𝐢𝐭𝐇𝐮𝐛: Add links to your GitHub repositories with coding projects and Power BI/Tableau dashboards.

𝟔. 𝐆𝐚𝐢𝐧 𝐏𝐫𝐚𝐜𝐭𝐢𝐜𝐚𝐥 𝐄𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 (𝐅𝐨𝐫 𝐅𝐫𝐞𝐬𝐡𝐞𝐫𝐬)
If you're a fresher, here are some ideas to gain experience:
𝐈𝐧𝐭𝐞𝐫𝐧𝐬𝐡𝐢𝐩𝐬: Apply for internships at companies where you can work on real data problems.
𝐅𝐫𝐞𝐞𝐥𝐚𝐧𝐜𝐢𝐧𝐠: Offer data analysis services on platforms like Upwork, Fiverr, or Freelancer.
𝐏𝐞𝐫𝐬𝐨𝐧𝐚𝐥 𝐏𝐫𝐨𝐣𝐞𝐜𝐭𝐬: Build your own projects, such as analyzing public datasets (e.g., from Kaggle), and share them on GitHub.
𝐎𝐧𝐥𝐢𝐧𝐞 𝐂𝐨𝐦𝐩𝐞𝐭𝐢𝐭𝐢𝐨𝐧𝐬: Participate in data analysis competitions on Kaggle or DrivenData to build your skills and gain recognition.
𝐎𝐩𝐞𝐧-𝐒𝐨𝐮𝐫𝐜𝐞: Contribute to open-source data analysis projects on GitHub.

𝟕. 𝐒𝐭𝐚𝐫𝐭 𝐀𝐩𝐩𝐥𝐲𝐢𝐧𝐠 𝐟𝐨𝐫 𝐉𝐨𝐛𝐬
Tailor your resume and portfolio for each role. Highlight projects and key skills. Consider entry-level roles like:
Junior Data Analyst, Business Analyst, Reporting Analyst
Use platforms like LinkedIn & Naukri to apply for jobs.

Steps to become a data analyst

Learn the Basics of Data Analysis:
Familiarize yourself with foundational concepts in data analysis, statistics, and data visualization. Online courses and textbooks can help.
Free books & other useful data analysis resources - https://t.iss.one/learndataanalysis

Develop Technical Skills:
Gain proficiency in essential tools and technologies such as:

SQL: Learn how to query and manipulate data in relational databases.
Free Resources- @sqlanalyst

Excel: Master data manipulation, basic analysis, and visualization.
Free Resources- @excel_analyst

Data Visualization Tools: Become skilled in tools like Tableau, Power BI, or Python libraries like Matplotlib and Seaborn.
Free Resources- @PowerBI_analyst

Programming: Learn a programming language like Python or R for data analysis and manipulation.
Free Resources- @pythonanalyst

Statistical Packages: Familiarize yourself with packages like Pandas, NumPy, and SciPy (for Python) or ggplot2 (for R).

Hands-On Practice:
Apply your knowledge to real datasets. You can find publicly available datasets on platforms like Kaggle or create your datasets for analysis.

Build a Portfolio:
Create data analysis projects to showcase your skills. Share them on platforms like GitHub, where potential employers can see your work.

Networking:
Attend data-related meetups, conferences, and online communities. Networking can lead to job opportunities and valuable insights.

Data Analysis Projects:
Work on personal or freelance data analysis projects to gain experience and demonstrate your abilities.

Job Search:
Start applying for entry-level data analyst positions or internships. Look for job listings on company websites, job boards, and LinkedIn.
Jobs & Internship opportunities: @getjobss

Prepare for Interviews:
Practice common data analyst interview questions and be ready to discuss your past projects and experiences.

Continual Learning:
The field of data analysis is constantly evolving. Stay updated with new tools, techniques, and industry trends.

Soft Skills:
Develop soft skills like critical thinking, problem-solving, communication, and attention to detail, as they are crucial for data analysts.

Never ever give up:
The journey to becoming a data analyst can be challenging, with complex concepts and technical skills to learn. There may be moments of frustration and self-doubt, but remember that these are normal parts of the learning process. Keep pushing through setbacks, keep learning, and stay committed to your goal.

ENJOY LEARNING 👍👍

Start your career in data analysis for freshers 😄👇

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.

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Data Analyst Roadmap in 2025
👇👇
https://www.linkedin.com/posts/sql-analysts_data-analyst-roadmap-in-2025-week-1-activity-7273223488985849856-NX_b

SQL is the gateway to all data jobs

You need to learn SQL to become:
• a data analyst
• a data scientist
• a data engineer

You can start your data journey today by:
• Learning SQL
• Getting familiar with SQL
• Build confidence by building projects with SQL

This is the path to become a data professional.

How to become a DIY data analyst:

Avoid formal education such as:
• Tutorials
• Bootcamps
• Certifications
• Expensive degrees

Instead your learnings on:
• SQL
• DAX
• PowerBi
• Building projects

Practical skills > Theorical skills is the DIY way.

Follow the Data Analysts - SQL, Tableau, Excel, Power BI & Python channel on WhatsApp
👇👇
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Data Analyst Interview Questions

Essential Python and SQL topics for data analysts 😄👇

Python Topics:

Python Resources - @pythonanalyst

1. Data Structures
   - Lists, Tuples, and Dictionaries
   - NumPy Arrays for numerical data

2. Data Manipulation
   - Pandas DataFrames for structured data
   - Data Cleaning and Preprocessing techniques
   - Data Transformation and Reshaping

3. Data Visualization
   - Matplotlib for basic plotting
   - Seaborn for statistical visualizations
   - Plotly for interactive charts

4. Statistical Analysis
   - Descriptive Statistics
   - Hypothesis Testing
   - Regression Analysis

5. Machine Learning
   - Scikit-Learn for machine learning models
   - Model Building, Training, and Evaluation
   - Feature Engineering and Selection

6. Time Series Analysis
   - Handling Time Series Data
   - Time Series Forecasting
   - Anomaly Detection

7. Python Fundamentals
   - Control Flow (if statements, loops)
   - Functions and Modular Code
   - Exception Handling
   - File

SQL Topics:

SQL Resources - @sqlanalyst

1. SQL Basics
- SQL Syntax
- SELECT Queries
- Filters

2. Data Retrieval
- Aggregation Functions (SUM, AVG, COUNT)
- GROUP BY

3. Data Filtering
- WHERE Clause
- ORDER BY

4. Data Joins
- JOIN Operations
- Subqueries

5. Advanced SQL
- Window Functions
- Indexing
- Performance Optimization

6. Database Management
- Connecting to Databases
- SQLAlchemy

7. Database Design
- Data Types
- Normalization

Remember, it's highly likely that you won't know all these concepts from the start. Data analysis is a journey where the more you learn, the more you grow. Embrace the learning process, and your skills will continually evolve and expand. Keep up the great work!

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𝗢𝗿𝗱𝗲𝗿 𝗢𝗳 𝗘𝘅𝗲𝗰𝘂𝘁𝗶𝗼𝗻 in SQL ↓

1 → FROM (Tables selected).
2 → WHERE (Filters applied).
3 → GROUP BY (Rows grouped).
4 → HAVING (Filter on grouped data).
5 → SELECT (Columns selected).
6 → ORDER BY (Sort the data).
7 → LIMIT (Restrict number of rows).

𝗖𝗼𝗺𝗺𝗼𝗻 𝗤𝘂𝗲𝗿𝗶𝗲𝘀 𝗧𝗼 𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗲 ↓

↬ Find the second-highest salary:

SELECT MAX(Salary) FROM Employees WHERE Salary < (SELECT MAX(Salary) FROM Employees);

↬ Find duplicate records:

SELECT Name, COUNT(*)
FROM Emp
GROUP BY Name
HAVING COUNT(*) > 1;

Top 10 Excel Interview Questions with Answers 😄👇

Free Resources to learn Excel: https://t.iss.one/excel_analyst

1. Question: What is the difference between CONCATENATE and "&" in Excel?

Answer: CONCATENATE and "&" both combine text, but "&" is more concise. For example, =A1&B1 achieves the same result as =CONCATENATE(A1, B1).

2. Question: How can you freeze rows and columns simultaneously in Excel?

Answer: Use the "Freeze Panes" option under the "View" tab. Select the cell below and to the right of the rows and columns you want to freeze, and then click on "Freeze Panes."

3. Question: Explain the VLOOKUP function and when would you use it?

Answer: VLOOKUP searches for a value in the first column of a range and returns a corresponding value in the same row from another column. It's useful for looking up information in a table based on a specific criteria.

4. Question: What is the purpose of the IFERROR function?

Answer: IFERROR is used to handle errors in Excel formulas. It returns a specified value if a formula results in an error, and the actual result if there's no error.

5. Question: How do you create a PivotTable, and what is its purpose?

Answer: To create a PivotTable, select your data, go to the "Insert" tab, and choose "PivotTable." It summarizes and analyzes data in a spreadsheet, allowing you to make sense of large datasets.

6. Question: Explain the difference between relative and absolute cell references.

Answer: Relative references change when you copy a formula to another cell, while absolute references stay fixed. Use a $ symbol to make a reference absolute (e.g., $A$1).

7. Question: What is the purpose of the INDEX and MATCH functions?

Answer: INDEX returns a value in a specified range based on the row and column number, while MATCH searches for a value in a range and returns its relative position. Combined, they provide a flexible way to look up data.

8. Question: How can you find and remove duplicate values in Excel?

Answer: Use the "Remove Duplicates" feature under the "Data" tab. Select the range containing duplicates, go to "Data" -> "Remove Duplicates," and choose the columns to check for duplicates.

9. Question: Explain the difference between a workbook and a worksheet.

Answer: A workbook is the entire Excel file, while a worksheet is a single sheet within that file. Workbooks can contain multiple worksheets.

10. Question: What is the purpose of the COUNTIF function?

Answer: COUNTIF counts the number of cells within a range that meet a specified condition. For example, =COUNTIF(A1:A10, ">50") counts the cells in A1 to A10 that are greater than 50.

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How to become a Data Analyst in 2025

Skills Required in Data Analytics

Brain of data analysts ✅

Hello friends,

I hope you all are very well, see many of you are messaging me about the roadmap and career of Python, Excel, Power BI, SQL, message everyone one by one for me, so I created a WhatsApp channel where you get all this, I give the link below, you can join it from here 👇

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Complete Syllabus for Data Analytics interview:

SQL:
1. Basic   
- SELECT statements with WHERE, ORDER BY, GROUP BY, HAVING   
- Basic JOINS (INNER, LEFT, RIGHT, FULL)   
- Creating and using simple databases and tables

2. Intermediate   
- Aggregate functions (COUNT, SUM, AVG, MAX, MIN)   
- Subqueries and nested queries
- Common Table Expressions (WITH clause)   
- CASE statements for conditional logic in queries
3. Advanced   
- Advanced JOIN techniques (self-join, non-equi join)   
- Window functions (OVER, PARTITION BY, ROW_NUMBER, RANK, DENSE_RANK, lead, lag)   
- optimization with indexing   
- Data manipulation (INSERT, UPDATE, DELETE)

Python:
1. Basic   
- Syntax, variables, data types (integers, floats, strings, booleans)   
- Control structures (if-else, for and while loops)   
- Basic data structures (lists, dictionaries, sets, tuples)   
- Functions, lambda functions, error handling (try-except)   
- Modules and packages

2. Pandas & Numpy   
- Creating and manipulating DataFrames and Series   
- Indexing, selecting, and filtering data   
- Handling missing data (fillna, dropna)   
- Data aggregation with groupby, summarizing data
- Merging, joining, and concatenating datasets

3. Basic Visualization   
- Basic plotting with Matplotlib (line plots, bar plots, histograms)   
- Visualization with Seaborn (scatter plots, box plots, pair plots)   
PH4N745M
- Customizing plots (sizes, labels, legends, color palettes)   
- Introduction to interactive visualizations (e.g., Plotly)

Excel:
1. Basic   
- Cell operations, basic formulas (SUMIFS, COUNTIFS, AVERAGEIFS, IF, AND, OR, NOT & Nested Functions etc.)   
- Introduction to charts and basic data visualization   
- Data sorting and filtering   
- Conditional formatting

2. Intermediate   
- Advanced formulas (V/XLOOKUP, INDEX-MATCH, nested IF)   
- PivotTables and PivotCharts for summarizing data   
- Data validation tools   
- What-if analysis tools (Data Tables, Goal Seek)

3. Advanced   
- Array formulas and advanced functions   
- Data Model & Power Pivot
- Advanced Filter
- Slicers and Timelines in Pivot Tables   
- Dynamic charts and interactive dashboards

Power BI:
1. Data Modeling   
- Importing data from various sources   
- Creating and managing relationships between different datasets   
- Data modeling basics (star schema, snowflake schema)

2. Data Transformation   
- Using Power Query for data cleaning and transformation   
- Advanced data shaping techniques   
- Calculated columns and measures using DAX

3. Data Visualization and Reporting
- Creating interactive reports and dashboards   
- Visualizations (bar, line, pie charts, maps)   
- Publishing and sharing reports, scheduling data refreshes

Statistics Fundamentals: Mean, Median, Mode, Standard Deviation, Variance, Probability Distributions, Hypothesis Testing, P-values, Confidence Intervals, Correlation, Simple Linear Regression, Normal Distribution, Binomial Distribution, Poisson Distribution.

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How to become a Data Analyst in 2025