Quick Power BI Dax Revision
1. Measures: Measures in DAX are calculations that are used in Power BI to perform aggregations, calculations, and comparisons on data. They are defined using the DEFINE MEASURE or CALCULATE functions.
2. Calculated Columns: Calculated columns are columns that are created in a table by using DAX expressions. They are calculated row by row when the data is loaded into the model.
3. DAX Functions: DAX provides a wide range of functions for data manipulation and calculation. Some common functions include SUM, AVERAGE, COUNT, FILTER, CALCULATE, RELATED, ALL, ALLEXCEPT, and many more.
4. Context: DAX calculations are performed within a context, which can be row context or filter context. Understanding how context works is crucial for writing accurate DAX expressions.
5. Relationships: Power BI data models are built on relationships between tables. DAX expressions can leverage these relationships to perform calculations across related tables.
6. Time Intelligence Functions: DAX includes a set of time intelligence functions that enable you to perform calculations based on dates and time periods. Examples include TOTALYTD, SAMEPERIODLASTYEAR, DATESBETWEEN, etc.
7. Variables: DAX allows you to declare and use variables within expressions to improve readability and performance of complex calculations.
8. Aggregation Functions: DAX provides aggregation functions like SUMX, AVERAGEX, COUNTX that allow you to iterate over a table and perform aggregations based on specified conditions.
9. Logical Functions: DAX includes logical functions such as IF, AND, OR, SWITCH that help in implementing conditional logic within calculations.
10. Error Handling: DAX provides functions like ISBLANK, IFERROR, BLANK, etc., for handling errors and missing data in calculations.
React ❤️ for more quick recaps
Power BI Resources: https://whatsapp.com/channel/0029Vai1xKf1dAvuk6s1v22c
1. Measures: Measures in DAX are calculations that are used in Power BI to perform aggregations, calculations, and comparisons on data. They are defined using the DEFINE MEASURE or CALCULATE functions.
2. Calculated Columns: Calculated columns are columns that are created in a table by using DAX expressions. They are calculated row by row when the data is loaded into the model.
3. DAX Functions: DAX provides a wide range of functions for data manipulation and calculation. Some common functions include SUM, AVERAGE, COUNT, FILTER, CALCULATE, RELATED, ALL, ALLEXCEPT, and many more.
4. Context: DAX calculations are performed within a context, which can be row context or filter context. Understanding how context works is crucial for writing accurate DAX expressions.
5. Relationships: Power BI data models are built on relationships between tables. DAX expressions can leverage these relationships to perform calculations across related tables.
6. Time Intelligence Functions: DAX includes a set of time intelligence functions that enable you to perform calculations based on dates and time periods. Examples include TOTALYTD, SAMEPERIODLASTYEAR, DATESBETWEEN, etc.
7. Variables: DAX allows you to declare and use variables within expressions to improve readability and performance of complex calculations.
8. Aggregation Functions: DAX provides aggregation functions like SUMX, AVERAGEX, COUNTX that allow you to iterate over a table and perform aggregations based on specified conditions.
9. Logical Functions: DAX includes logical functions such as IF, AND, OR, SWITCH that help in implementing conditional logic within calculations.
10. Error Handling: DAX provides functions like ISBLANK, IFERROR, BLANK, etc., for handling errors and missing data in calculations.
React ❤️ for more quick recaps
Power BI Resources: https://whatsapp.com/channel/0029Vai1xKf1dAvuk6s1v22c
👍5❤4
When preparing for a Power BI interview, you should be ready to answer questions that assess your practical experience, understanding of Power BI’s features, and ability to solve real-world business problems using Power BI. Here are some key questions you might encounter, along with tips on how to answer them:
1. Can you describe a Power BI project you worked on? What was your role?
- Tip: Provide a detailed overview of the project, including the business problem, your role in the project, the data sources used, key metrics tracked, and the overall impact of the project. Focus on how you contributed to the project’s success.
2. How do you approach designing a dashboard in Power BI?
- Tip: Explain your process, from understanding the user’s requirements to planning the layout, choosing appropriate visuals, ensuring data accuracy, and focusing on user experience. Mention how you ensure the dashboard is both insightful and easy to use.
3. What are the challenges you’ve faced while working on Power BI projects, and how did you overcome them?
- Tip: Discuss specific challenges like data integration issues, performance optimization, or dealing with complex DAX calculations. Emphasize how you identified the issue and the steps you took to resolve it.
4. How do you manage large datasets in Power BI to ensure optimal performance?
- Tip: Talk about techniques like using DirectQuery, aggregations, optimizing data models, using measures instead of calculated columns, and leveraging Power BI’s performance analyzer to optimize the performance of reports.
5. How do you handle data security in Power BI?
- Tip: Discuss your experience with implementing row-level security (RLS), managing permissions, and ensuring sensitive data is protected. Mention any experience you have with setting up role-based access controls.
6. Can you explain how you use DAX in Power BI to create complex calculations?
- Tip: Provide examples of DAX formulas you’ve written to solve specific business problems. Discuss the logic behind the calculations and how they were used in your reports or dashboards.
7. How do you integrate Power BI with other tools or systems?
- Tip: Talk about your experience integrating Power BI with databases (like SQL Server), Excel, SharePoint, or using APIs to pull in data. Also, mention how you might export data or reports to other tools like Excel or PowerPoint.
8. Describe a situation where you used Power BI to provide insights that led to a significant business decision.
- Tip: Share a specific example where your Power BI report or dashboard uncovered insights that impacted the business. Focus on the outcome and how your analysis influenced the decision-making process.
9. How do you stay updated with new features and updates in Power BI?
- Tip: Mention resources you use like Microsoft’s Power BI blog, community forums, attending webinars, or taking courses. Emphasize the importance of continuous learning in your role.
10. What is your approach to troubleshooting a Power BI report that isn’t working as expected?
- Tip: Describe a systematic approach to identifying the root cause, whether it’s related to data refresh issues, incorrect DAX formulas, or visualization problems.
11. Can you walk us through how you set up and manage Power BI dataflows?
- Tip: Explain the process of creating dataflows, how you configure them to transform and clean data, and how they help in centralizing and reusing data across multiple reports.
13. How do you handle version control and collaboration in Power BI?
- Tip: Discuss how you use tools like OneDrive, SharePoint, or Power BI Service for version control, and how you collaborate with other team members on reports and dashboards.
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1. Can you describe a Power BI project you worked on? What was your role?
- Tip: Provide a detailed overview of the project, including the business problem, your role in the project, the data sources used, key metrics tracked, and the overall impact of the project. Focus on how you contributed to the project’s success.
2. How do you approach designing a dashboard in Power BI?
- Tip: Explain your process, from understanding the user’s requirements to planning the layout, choosing appropriate visuals, ensuring data accuracy, and focusing on user experience. Mention how you ensure the dashboard is both insightful and easy to use.
3. What are the challenges you’ve faced while working on Power BI projects, and how did you overcome them?
- Tip: Discuss specific challenges like data integration issues, performance optimization, or dealing with complex DAX calculations. Emphasize how you identified the issue and the steps you took to resolve it.
4. How do you manage large datasets in Power BI to ensure optimal performance?
- Tip: Talk about techniques like using DirectQuery, aggregations, optimizing data models, using measures instead of calculated columns, and leveraging Power BI’s performance analyzer to optimize the performance of reports.
5. How do you handle data security in Power BI?
- Tip: Discuss your experience with implementing row-level security (RLS), managing permissions, and ensuring sensitive data is protected. Mention any experience you have with setting up role-based access controls.
6. Can you explain how you use DAX in Power BI to create complex calculations?
- Tip: Provide examples of DAX formulas you’ve written to solve specific business problems. Discuss the logic behind the calculations and how they were used in your reports or dashboards.
7. How do you integrate Power BI with other tools or systems?
- Tip: Talk about your experience integrating Power BI with databases (like SQL Server), Excel, SharePoint, or using APIs to pull in data. Also, mention how you might export data or reports to other tools like Excel or PowerPoint.
8. Describe a situation where you used Power BI to provide insights that led to a significant business decision.
- Tip: Share a specific example where your Power BI report or dashboard uncovered insights that impacted the business. Focus on the outcome and how your analysis influenced the decision-making process.
9. How do you stay updated with new features and updates in Power BI?
- Tip: Mention resources you use like Microsoft’s Power BI blog, community forums, attending webinars, or taking courses. Emphasize the importance of continuous learning in your role.
10. What is your approach to troubleshooting a Power BI report that isn’t working as expected?
- Tip: Describe a systematic approach to identifying the root cause, whether it’s related to data refresh issues, incorrect DAX formulas, or visualization problems.
11. Can you walk us through how you set up and manage Power BI dataflows?
- Tip: Explain the process of creating dataflows, how you configure them to transform and clean data, and how they help in centralizing and reusing data across multiple reports.
13. How do you handle version control and collaboration in Power BI?
- Tip: Discuss how you use tools like OneDrive, SharePoint, or Power BI Service for version control, and how you collaborate with other team members on reports and dashboards.
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Data Analyst Interview Questions with Answers
Q1: How would you handle real-time data streaming for analyzing user listening patterns?
Ans: I'd use platforms like Apache Kafka for real-time data ingestion. Using Python, I'd process this stream to identify real-time patterns and store aggregated data for further analysis.
Q2: Describe a situation where you had to use time series analysis to forecast a trend.
Ans: I analyzed monthly active users to forecast future growth. Using Python's statsmodels, I applied ARIMA modeling to the time series data and provided a forecast for the next six months.
Q3: How would you segment and analyze user behavior based on their music preferences?
Ans: I'd cluster users based on their listening history using unsupervised machine learning techniques like K-means clustering. This would help in creating personalized playlists or recommendations.
Q4: How do you handle missing or incomplete data in user listening logs?
Ans: I'd use imputation methods based on the nature of the missing data. For instance, if a user's listening time is missing, I might impute it based on their average listening time or use collaborative filtering methods to estimate it based on similar users.
Q1: How would you handle real-time data streaming for analyzing user listening patterns?
Ans: I'd use platforms like Apache Kafka for real-time data ingestion. Using Python, I'd process this stream to identify real-time patterns and store aggregated data for further analysis.
Q2: Describe a situation where you had to use time series analysis to forecast a trend.
Ans: I analyzed monthly active users to forecast future growth. Using Python's statsmodels, I applied ARIMA modeling to the time series data and provided a forecast for the next six months.
Q3: How would you segment and analyze user behavior based on their music preferences?
Ans: I'd cluster users based on their listening history using unsupervised machine learning techniques like K-means clustering. This would help in creating personalized playlists or recommendations.
Q4: How do you handle missing or incomplete data in user listening logs?
Ans: I'd use imputation methods based on the nature of the missing data. For instance, if a user's listening time is missing, I might impute it based on their average listening time or use collaborative filtering methods to estimate it based on similar users.
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Essential Python and SQL topics for data analysts 😄👇
Python Topics:
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
- Denoscriptive 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:
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!
Python Resources - https://whatsapp.com/channel/0029VaiM08SDuMRaGKd9Wv0L
SQL Resources - https://whatsapp.com/channel/0029VanC5rODzgT6TiTGoa1v
Hope it helps :)
Python Topics:
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
- Denoscriptive 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:
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!
Python Resources - https://whatsapp.com/channel/0029VaiM08SDuMRaGKd9Wv0L
SQL Resources - https://whatsapp.com/channel/0029VanC5rODzgT6TiTGoa1v
Hope it helps :)
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Here are some tricky🧩 SQL interview questions!
1. Find the second-highest salary in a table without using LIMIT or TOP.
2. Write a SQL query to find all employees who earn more than their managers.
3. Find the duplicate rows in a table without using GROUP BY.
4. Write a SQL query to find the top 10% of earners in a table.
5. Find the cumulative sum of a column in a table.
6. Write a SQL query to find all employees who have never taken a leave.
7. Find the difference between the current row and the next row in a table.
8. Write a SQL query to find all departments with more than one employee.
9. Find the maximum value of a column for each group without using GROUP BY.
10. Write a SQL query to find all employees who have taken more than 3 leaves in a month.
These questions are designed to test your SQL skills, including your ability to write efficient queries, think creatively, and solve complex problems.
Here are the answers to these questions:
1. SELECT MAX(salary) FROM table WHERE salary NOT IN (SELECT MAX(salary) FROM table)
2. SELECT e1.* FROM employees e1 JOIN employees e2 ON e1.manager_id = (link unavailable) WHERE e1.salary > e2.salary
3. SELECT * FROM table WHERE rowid IN (SELECT rowid FROM table GROUP BY column HAVING COUNT(*) > 1)
4. SELECT * FROM table WHERE salary > (SELECT PERCENTILE_CONT(0.9) WITHIN GROUP (ORDER BY salary) FROM table)
5. SELECT column, SUM(column) OVER (ORDER BY rowid) FROM table
6. SELECT * FROM employees WHERE id NOT IN (SELECT employee_id FROM leaves)
7. SELECT *, column - LEAD(column) OVER (ORDER BY rowid) FROM table
8. SELECT department FROM employees GROUP BY department HAVING COUNT(*) > 1
9. SELECT MAX(column) FROM table WHERE column NOT IN (SELECT MAX(column) FROM table GROUP BY group_column)
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1. Find the second-highest salary in a table without using LIMIT or TOP.
2. Write a SQL query to find all employees who earn more than their managers.
3. Find the duplicate rows in a table without using GROUP BY.
4. Write a SQL query to find the top 10% of earners in a table.
5. Find the cumulative sum of a column in a table.
6. Write a SQL query to find all employees who have never taken a leave.
7. Find the difference between the current row and the next row in a table.
8. Write a SQL query to find all departments with more than one employee.
9. Find the maximum value of a column for each group without using GROUP BY.
10. Write a SQL query to find all employees who have taken more than 3 leaves in a month.
These questions are designed to test your SQL skills, including your ability to write efficient queries, think creatively, and solve complex problems.
Here are the answers to these questions:
1. SELECT MAX(salary) FROM table WHERE salary NOT IN (SELECT MAX(salary) FROM table)
2. SELECT e1.* FROM employees e1 JOIN employees e2 ON e1.manager_id = (link unavailable) WHERE e1.salary > e2.salary
3. SELECT * FROM table WHERE rowid IN (SELECT rowid FROM table GROUP BY column HAVING COUNT(*) > 1)
4. SELECT * FROM table WHERE salary > (SELECT PERCENTILE_CONT(0.9) WITHIN GROUP (ORDER BY salary) FROM table)
5. SELECT column, SUM(column) OVER (ORDER BY rowid) FROM table
6. SELECT * FROM employees WHERE id NOT IN (SELECT employee_id FROM leaves)
7. SELECT *, column - LEAD(column) OVER (ORDER BY rowid) FROM table
8. SELECT department FROM employees GROUP BY department HAVING COUNT(*) > 1
9. SELECT MAX(column) FROM table WHERE column NOT IN (SELECT MAX(column) FROM table GROUP BY group_column)
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👍8❤3
Roadmap to become a data analyst
1. Foundation Skills:
•Strengthen Mathematics: Focus on statistics relevant to data analysis.
•Excel Basics: Master fundamental Excel functions and formulas.
2. SQL Proficiency:
•Learn SQL Basics: Understand SELECT statements, JOINs, and filtering.
•Practice Database Queries: Work with databases to retrieve and manipulate data.
3. Excel Advanced Techniques:
•Data Cleaning in Excel: Learn to handle missing data and outliers.
•PivotTables and PivotCharts: Master these powerful tools for data summarization.
4. Data Visualization with Excel:
•Create Visualizations: Learn to build charts and graphs in Excel.
•Dashboard Creation: Understand how to design effective dashboards.
5. Power BI Introduction:
•Install and Explore Power BI: Familiarize yourself with the interface.
•Import Data: Learn to import and transform data using Power BI.
6. Power BI Data Modeling:
•Relationships: Understand and establish relationships between tables.
•DAX (Data Analysis Expressions): Learn the basics of DAX for calculations.
7. Advanced Power BI Features:
•Advanced Visualizations: Explore complex visualizations in Power BI.
•Custom Measures and Columns: Utilize DAX for customized data calculations.
8. Integration of Excel, SQL, and Power BI:
•Importing Data from SQL to Power BI: Practice connecting and importing data.
•Excel and Power BI Integration: Learn how to use Excel data in Power BI.
9. Business Intelligence Best Practices:
•Data Storytelling: Develop skills in presenting insights effectively.
•Performance Optimization: Optimize reports and dashboards for efficiency.
10. Build a Portfolio:
•Showcase Excel Projects: Highlight your data analysis skills using Excel.
•Power BI Projects: Feature Power BI dashboards and reports in your portfolio.
11. Continuous Learning and Certification:
•Stay Updated: Keep track of new features in Excel, SQL, and Power BI.
•Consider Certifications: Obtain relevant certifications to validate your skills.
1. Foundation Skills:
•Strengthen Mathematics: Focus on statistics relevant to data analysis.
•Excel Basics: Master fundamental Excel functions and formulas.
2. SQL Proficiency:
•Learn SQL Basics: Understand SELECT statements, JOINs, and filtering.
•Practice Database Queries: Work with databases to retrieve and manipulate data.
3. Excel Advanced Techniques:
•Data Cleaning in Excel: Learn to handle missing data and outliers.
•PivotTables and PivotCharts: Master these powerful tools for data summarization.
4. Data Visualization with Excel:
•Create Visualizations: Learn to build charts and graphs in Excel.
•Dashboard Creation: Understand how to design effective dashboards.
5. Power BI Introduction:
•Install and Explore Power BI: Familiarize yourself with the interface.
•Import Data: Learn to import and transform data using Power BI.
6. Power BI Data Modeling:
•Relationships: Understand and establish relationships between tables.
•DAX (Data Analysis Expressions): Learn the basics of DAX for calculations.
7. Advanced Power BI Features:
•Advanced Visualizations: Explore complex visualizations in Power BI.
•Custom Measures and Columns: Utilize DAX for customized data calculations.
8. Integration of Excel, SQL, and Power BI:
•Importing Data from SQL to Power BI: Practice connecting and importing data.
•Excel and Power BI Integration: Learn how to use Excel data in Power BI.
9. Business Intelligence Best Practices:
•Data Storytelling: Develop skills in presenting insights effectively.
•Performance Optimization: Optimize reports and dashboards for efficiency.
10. Build a Portfolio:
•Showcase Excel Projects: Highlight your data analysis skills using Excel.
•Power BI Projects: Feature Power BI dashboards and reports in your portfolio.
11. Continuous Learning and Certification:
•Stay Updated: Keep track of new features in Excel, SQL, and Power BI.
•Consider Certifications: Obtain relevant certifications to validate your skills.
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If you want to Excel at using the most used database language in the world, learn these powerful SQL features:
• Wildcards (%, _) – Flexible pattern matching
• Window Functions – ROW_NUMBER(), RANK(), DENSE_RANK(), LEAD(), LAG()
• Common Table Expressions (CTEs) – WITH for better readability
• Recursive Queries – Handle hierarchical data
• STRING Functions – LEFT(), RIGHT(), LEN(), TRIM(), UPPER(), LOWER()
• Date Functions – DATEDIFF(), DATEADD(), FORMAT()
• Pivot & Unpivot – Transform row data into columns
• Aggregate Functions – SUM(), AVG(), COUNT(), MIN(), MAX()
• Joins & Self Joins – Master INNER, LEFT, RIGHT, FULL, SELF JOIN
• Indexing – Speed up queries with CREATE INDEX
Like it if you need a complete tutorial on all these topics! 👍❤️
#sql
• Wildcards (%, _) – Flexible pattern matching
• Window Functions – ROW_NUMBER(), RANK(), DENSE_RANK(), LEAD(), LAG()
• Common Table Expressions (CTEs) – WITH for better readability
• Recursive Queries – Handle hierarchical data
• STRING Functions – LEFT(), RIGHT(), LEN(), TRIM(), UPPER(), LOWER()
• Date Functions – DATEDIFF(), DATEADD(), FORMAT()
• Pivot & Unpivot – Transform row data into columns
• Aggregate Functions – SUM(), AVG(), COUNT(), MIN(), MAX()
• Joins & Self Joins – Master INNER, LEFT, RIGHT, FULL, SELF JOIN
• Indexing – Speed up queries with CREATE INDEX
Like it if you need a complete tutorial on all these topics! 👍❤️
#sql
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How to Become a Data Analyst from Scratch! 🚀
Whether you're starting fresh or upskilling, here's your roadmap:
➜ Master Excel and SQL - solve SQL problems from leetcode & hackerank
➜ Get the hang of either Power BI or Tableau - do some hands-on projects
➜ learn what the heck ATS is and how to get around it
➜ learn to be ready for any interview question
➜ Build projects for a data portfolio
➜ And you don't need to do it all at once!
➜ Fail and learn to pick yourself up whenever required
Whether it's acing interviews or building an impressive portfolio, give yourself the space to learn, fail, and grow. Good things take time ✅
Like if it helps ❤️
I have curated best 80+ top-notch Data Analytics Resources 👇👇
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Hope it helps :)
Whether you're starting fresh or upskilling, here's your roadmap:
➜ Master Excel and SQL - solve SQL problems from leetcode & hackerank
➜ Get the hang of either Power BI or Tableau - do some hands-on projects
➜ learn what the heck ATS is and how to get around it
➜ learn to be ready for any interview question
➜ Build projects for a data portfolio
➜ And you don't need to do it all at once!
➜ Fail and learn to pick yourself up whenever required
Whether it's acing interviews or building an impressive portfolio, give yourself the space to learn, fail, and grow. Good things take time ✅
Like if it helps ❤️
I have curated best 80+ top-notch Data Analytics Resources 👇👇
https://topmate.io/analyst/861634
Hope it helps :)
👍13❤5🥰1🎉1