Python for Data Analysts
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Find top Python resources from global universities, cool projects, and learning materials for data analytics.

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Almost everyone knows that these are the tools a Data Analyst works with:

➡️ SQL
➡️ Excel
➡️ Power BI/Tableau
➡️ Python

But people getting started with analytics are confused about the preferences of picking these tools.

There are various kinds of data analytics roles available in the market :

➡️ BI + SQL: Will primarily be involved in BI development.

➡️ SQL + Excel: Will primarily work on Excel reporting.

➡️ SQL + Python: Will primarily do data analysis using python.

Now, If you are getting started with learning analytics, choose any one role that interests you the most and focus on completing the primary tools that the role requires. Learn them VERY WELL.

Learn any of the above combinations that interests you first and then start looking out for opportunities which ask for these primary tools and simultaneously start learning the basics of the 3rd tool.

You don't have to focus on being good with each and every tool but being good with any of the above combinations always works.

Join this channel to learn everything about Data Analytics 👇
https://t.iss.one/sqlspecialist

Hope this helps you 😊
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10 SQL Concepts Every Data Analyst Should Master 👇

SELECT, WHERE, ORDER BY – Core of querying your data
JOINs (INNER, LEFT, RIGHT, FULL) – Combine data from multiple tables
GROUP BY & HAVING – Aggregate and filter grouped data
Subqueries – Nest queries inside queries for complex logic
CTEs (Common Table Expressions) – Write cleaner, reusable SQL logic
Window Functions – Perform advanced analytics like rankings & running totals
Indexes – Boost your query performance
Normalization – Structure your database efficiently
UNION vs UNION ALL – Combine result sets with or without duplicates
Stored Procedures & Functions – Reusable logic inside your DB

React with ❤️ if you want me to cover each topic in detail

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4
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Matrix Operations using Numpy Library
4
Data Analyst Interview Questions
[Python, SQL, PowerBI]

1. Is indentation required in python?
Ans:
Indentation is necessary for Python. It specifies a block of code. All code within loops, classes, functions, etc is specified within an indented block. It is usually done using four space characters. If your code is not indented necessarily, it will not execute accurately and will throw errors as well.

2. What are Entities and Relationships?
Ans:
Entity:
An entity can be a real-world object that can be easily identifiable. For example, in a college database, students, professors, workers, departments, and projects can be referred to as entities.

Relationships: Relations or links between entities that have something to do with each other. For example – The employee’s table in a company’s database can be associated with the salary table in the same database.

3. What are Aggregate and Scalar functions?
Ans:
An aggregate function performs operations on a collection of values to return a single scalar value. Aggregate functions are often used with the GROUP BY and HAVING clauses of the SELECT statement. A scalar function returns a single value based on the input value.

4. What are Custom Visuals in Power BI?
Ans:
Custom Visuals are like any other visualizations, generated using Power BI. The only difference is that it develops the custom visuals using a custom SDK. The languages like JQuery and JavaScript are used to create custom visuals in Power BI

ENJOY LEARNING 👍👍
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Forwarded from Data Analytics
𝟱 𝗣𝗼𝘄𝗲𝗿𝗳𝘂𝗹 𝗚𝗶𝘁𝗛𝘂𝗯 𝗥𝗲𝗽𝗼𝘀𝗶𝘁𝗼𝗿𝗶𝗲𝘀 𝘁𝗼 𝗠𝗮𝘀𝘁𝗲𝗿 𝗣𝘆𝘁𝗵𝗼𝗻 𝗳𝗼𝗿 𝗙𝗿𝗲𝗲😍

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Essential Pandas Functions for Data Analysis

Data Loading:

pd.read_csv() - Load data from a CSV file.

pd.read_excel() - Load data from an Excel file.


Data Inspection:

df.head(n) - View the first n rows.

df.info() - Get a summary of the dataset.

df.describe() - Generate summary statistics.


Data Manipulation:

df.drop(columns=['col1', 'col2']) - Remove specific columns.

df.rename(columns={'old_name': 'new_name'}) - Rename columns.

df['col'] = df['col'].apply(func) - Apply a function to a column.


Filtering and Sorting:

df[df['col'] > value] - Filter rows based on a condition.

df.sort_values(by='col', ascending=True) - Sort rows by a column.


Aggregation:

df.groupby('col').sum() - Group data and compute the sum.

df['col'].value_counts() - Count unique values in a column.


Merging and Joining:

pd.merge(df1, df2, on='key') - Merge two DataFrames.

pd.concat([df1, df2]) - Concatenate

Here you can find essential Python Interview Resources👇
https://whatsapp.com/channel/0029VaGgzAk72WTmQFERKh02

Like this post for more resources like this 👍♥️

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Preparing for a SQL interview?

Focus on mastering these essential topics:

1. Joins: Get comfortable with inner, left, right, and outer joins.
Knowing when to use what kind of join is important!

2. Window Functions: Understand when to use
ROW_NUMBER, RANK(), DENSE_RANK(), LAG, and LEAD for complex analytical queries.

3. Query Execution Order: Know the sequence from FROM to
ORDER BY. This is crucial for writing efficient, error-free queries.

4. Common Table Expressions (CTEs): Use CTEs to simplify and structure complex queries for better readability.

5. Aggregations & Window Functions: Combine aggregate functions with window functions for in-depth data analysis.

6. Subqueries: Learn how to use subqueries effectively within main SQL statements for complex data manipulations.

7. Handling NULLs: Be adept at managing NULL values to ensure accurate data processing and avoid potential pitfalls.

8. Indexing: Understand how proper indexing can significantly boost query performance.

9. GROUP BY & HAVING: Master grouping data and filtering groups with HAVING to refine your query results.

10. String Manipulation Functions: Get familiar with string functions like CONCAT, SUBSTRING, and REPLACE to handle text data efficiently.

11. Set Operations: Know how to use UNION, INTERSECT, and EXCEPT to combine or compare result sets.

12. Optimizing Queries: Learn techniques to optimize your queries for performance, especially with large datasets.

If we master/ Practice in these topics we can track any SQL interviews..

Like this post if you need more 👍❤️

Hope it helps :)
👍42
𝟳 𝗙𝗿𝗲𝗲 𝗖𝗼𝘂𝗿𝘀𝗲𝘀 𝘁𝗼 𝗨𝗽𝗴𝗿𝗮𝗱𝗲 𝗬𝗼𝘂𝗿 𝗥𝗲𝘀𝘂𝗺𝗲 𝗶𝗻 𝟮𝟬𝟮𝟱 𝗮𝗻𝗱 𝗦𝘁𝗮𝗻𝗱 𝗢𝘂𝘁😍

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Advanced Skills to Elevate Your Data Analytics Career

1️⃣ SQL Optimization & Performance Tuning

🚀 Learn indexing, query optimization, and execution plans to handle large datasets efficiently.

2️⃣ Machine Learning Basics

🤖 Understand supervised and unsupervised learning, feature engineering, and model evaluation to enhance analytical capabilities.

3️⃣ Big Data Technologies

🏗️ Explore Spark, Hadoop, and cloud platforms like AWS, Azure, or Google Cloud for large-scale data processing.

4️⃣ Data Engineering Skills

⚙️ Learn ETL pipelines, data warehousing, and workflow automation to streamline data processing.

5️⃣ Advanced Python for Analytics

🐍 Master libraries like Scikit-Learn, TensorFlow, and Statsmodels for predictive analytics and automation.

6️⃣ A/B Testing & Experimentation

🎯 Design and analyze controlled experiments to drive data-driven decision-making.

7️⃣ Dashboard Design & UX

🎨 Build interactive dashboards with Power BI, Tableau, or Looker that enhance user experience.

8️⃣ Cloud Data Analytics

☁️ Work with cloud databases like BigQuery, Snowflake, and Redshift for scalable analytics.

9️⃣ Domain Expertise

💼 Gain industry-specific knowledge (e.g., finance, healthcare, e-commerce) to provide more relevant insights.

🔟 Soft Skills & Leadership

💡 Develop stakeholder management, storytelling, and mentorship skills to advance in your career.

Hope it helps :)

#dataanalytics
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2
📊 Data Analyst Roadmap (2025)

Master the Skills That Top Companies Are Hiring For!

📍 1. Learn Excel / Google Sheets
Basic formulas & formatting
VLOOKUP, Pivot Tables, Charts
Data cleaning & conditional formatting

📍 2. Master SQL
SELECT, WHERE, ORDER BY
JOINs (INNER, LEFT, RIGHT)
GROUP BY, HAVING, LIMIT
Subqueries, CTEs, Window Functions

📍 3. Learn Data Visualization Tools
Power BI / Tableau (choose one)
Charts, filters, slicers
Dashboards & storytelling

📍 4. Get Comfortable with Statistics
Mean, Median, Mode, Std Dev
Probability basics
A/B Testing, Hypothesis Testing
Correlation & Regression

📍 5. Learn Python for Data Analysis (Optional but Powerful)
Pandas & NumPy for data handling
Seaborn, Matplotlib for visuals
Jupyter Notebooks for analysis

📍 6. Data Cleaning & Wrangling
Handle missing values
Fix data types, remove duplicates
Text processing & date formatting

📍 7. Understand Business Metrics
KPIs: Revenue, Churn, CAC, LTV
Think like a business analyst
Deliver actionable insights

📍 8. Communication & Storytelling
Present insights with clarity
Simplify complex data
Speak the language of stakeholders

📍 9. Version Control (Git & GitHub)
Track your projects
Build a data portfolio
Collaborate with the community

📍 10. Interview & Resume Preparation
Excel, SQL, case-based questions
Mock interviews + real projects
Resume with measurable achievements

React ❤️ for more
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Common Mistakes Data Analysts Must Avoid ⚠️📊

Even experienced analysts can fall into these traps. Avoid these mistakes to ensure accurate, impactful analysis!

1️⃣ Ignoring Data Cleaning 🧹
Messy data leads to misleading insights. Always check for missing values, duplicates, and inconsistencies before analysis.

2️⃣ Relying Only on Averages 📉
Averages hide variability. Always check median, percentiles, and distributions for a complete picture.

3️⃣ Confusing Correlation with Causation 🔗
Just because two things move together doesn’t mean one causes the other. Validate assumptions before making decisions.

4️⃣ Overcomplicating Visualizations 🎨
Too many colors, labels, or complex charts confuse your audience. Keep it simple, clear, and focused on key takeaways.

5️⃣ Not Understanding Business Context 🎯
Data without context is meaningless. Always ask: "What problem are we solving?" before diving into numbers.

6️⃣ Ignoring Outliers Without Investigation 🔍
Outliers can signal errors or valuable insights. Always analyze why they exist before deciding to remove them.

7️⃣ Using Small Sample Sizes ⚠️
Drawing conclusions from too little data leads to unreliable insights. Ensure your sample size is statistically significant.

8️⃣ Failing to Communicate Insights Clearly 🗣️
Great analysis means nothing if stakeholders don’t understand it. Tell a story with data—don’t just dump numbers.

9️⃣ Not Keeping Up with Industry Trends 🚀
Data tools and techniques evolve fast. Keep learning SQL, Python, Power BI, Tableau, and machine learning basics.

Avoid these mistakes, and you’ll stand out as a reliable data analyst!

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Hope it helps :)
6
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