Power BI & Tableau Resources
๐ Resources to learn Power BI, Tableau & Data Visualisation Perfect channel to start learning everything about Data Analytics Admin: @coderfun
Show more๐ Analytical overview of Telegram channel Power BI & Tableau Resources
Channel Power BI & Tableau Resources (@powerbi_analyst) in the English language segment is an active participant. Currently, the community unites 55 463 subscribers, ranking 3 082 in the Education category and 6 599 in the India region.
๐ Audience metrics and dynamics
Since its creation on ะฝะตะฒัะดะพะผะพ, the project has demonstrated rapid growth, gathering an audience of 55 463 subscribers.
According to the latest data from 14 June, 2026, the channel demonstrates stable activity. Although there has been a change in the number of participants by 330 over the last 30 days and by 13 over the last 24 hours, overall reach remains high.
- Verification status: Not verified
- Engagement rate (ER): The average audience engagement rate is 2.41%. Within the first 24 hours after publication, content typically collects 1.03% reactions from the total number of subscribers.
- Post reach: On average, each post receives 1 334 views. Within the first day, a publication typically gains 573 views.
- Reactions and interaction: The audience actively supports content: the average number of reactions per post is 3.
- Thematic interests: Content is focused on key topics such as dax, visual, dashboard, chart, slicer.
๐ Description and content policy
The author describes the resource as a platform for expressing subjective opinions:
โ๐ Resources to learn Power BI, Tableau & Data Visualisation
Perfect channel to start learning everything about Data Analytics
Admin: @coderfunโ
Thanks to the high frequency of updates (latest data received on 15 June, 2026), the channel maintains relevance and a high level of publication reach. Analytics show that the audience actively interacts with content, making it an important point of influence in the Education category.
SELECT * FROM Orders
WHERE Sales > (SELECT AVG(Sales) FROM Orders);
๐ 14. Common Table Expressions (CTE)
Makes complex queries easier.
WITH SalesCTE AS
(
SELECT Region, SUM(Sales) AS TotalSales
FROM Orders
GROUP BY Region
)
SELECT * FROM SalesCTE;
๐ Very common in Data Analyst interviews.
๐ 15. Window Functions (IMPORTANT)
ROW_NUMBER(): Assigns unique numbers
RANK(): Ranks with gaps
DENSE_RANK(): Ranks without gaps
๐ 16. Real-World SQL Query
Top 5 Products by Sales
SELECT Product, SUM(Sales) AS TotalSales
FROM Orders
GROUP BY Product
ORDER BY TotalSales DESC
LIMIT 5;
๐ 17. SQL Interview Questions
Beginner:
1. What is SQL?
2. Difference between WHERE and HAVING?
3. What is GROUP BY?
4. What is DISTINCT?
5. Explain aggregate functions.
Intermediate:
1. Difference between INNER and LEFT JOIN?
2. What is a CTE?
3. What are Window Functions?
4. What is a Subquery?
5. What is a Primary Key?
๐ 18. SQL Project
๐ E-Commerce Sales Analysis
Tables: Customers, Orders, Products
Tasks:
โ Total Revenue,
โ Top Products,
โ Monthly Sales,
โ Region Analysis,
โ Customer Analysis
๐ 19. Common SQL Mistakes
โ Missing JOIN conditions
โ Using SELECT * everywhere
โ Ignoring NULL values
โ Not using aliases
โ Poor filtering
๐ฏ Goal of This Topic
After completing SQL, you should be able to:
โ
Query databases confidently
โ
Use JOINS effectively
โ
Aggregate business data
โ
Solve interview questions
โ
Prepare data for Power BI
Double Tap โค๏ธ For More
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1.19 โฝ ยท /balance_helpSELECT *
FROM Customers;
Output: Returns all columns.
Select Specific Columns
SELECT Name, City
FROM Customers;
๐ Most commonly used SQL statement.
๐ 5. WHERE Clause
Used to filter records.
Example:
SELECT *
FROM Orders
WHERE Sales > 5000;
Output: Only orders with sales greater than 5000.
Multiple Conditions
SELECT *
FROM Orders
WHERE Sales > 5000
AND Region = 'West';
๐ 6. ORDER BY
Sorts data.
Ascending:
SELECT * FROM Orders ORDER BY Sales ASC;
Descending:
SELECT * FROM Orders ORDER BY Sales DESC;
๐ 7. DISTINCT
Removes duplicate values.
Example:
SELECT DISTINCT Region FROM Customers;
Output: Unique regions only.
๐ 8. Aggregate Functions
Used to summarize data.
COUNT: SELECT COUNT(*) FROM Orders; โ Counts rows.
SUM: SELECT SUM(Sales) FROM Orders; โ Calculates total sales.
AVG: SELECT AVG(Sales) FROM Orders; โ Calculates average sales.
MIN: SELECT MIN(Sales) FROM Orders; โ Smallest value.
MAX: SELECT MAX(Sales) FROM Orders; โ Largest value.
๐ 9. GROUP BY
Used for aggregation by category.
Example:
SELECT Region, SUM(Sales) AS TotalSales
FROM Orders
GROUP BY Region;
Output:
Region : TotalSales โ North : 50000, South : 70000
๐ 10. HAVING
Filters grouped data.
Example:
SELECT Region, SUM(Sales)
FROM Orders
GROUP BY Region
HAVING SUM(Sales) > 50000;
๐ HAVING works after GROUP BY.
๐ 11. SQL JOINS (VERY IMPORTANT)
Most interview questions come from JOINS.
INNER JOIN: Returns matching records.
LEFT JOIN: All records from left table + matching records from right table
RIGHT JOIN: All records from right table + matching records from left table
FULL JOIN: Returns all records from both tables
๐ 12. CASE WHEN
Used like IF statements.
SELECT Product,
CASE WHEN Sales > 10000 THEN 'High' ELSE 'Low' END AS Category
FROM Orders;
๐ 13. Subqueries
Query inside another query.Using data to make smarter business decisions.BI helps companies: โข Analyze sales โข Monitor performance โข Track KPIs โข Predict trends โข Improve profits ๐ 4. What is Power BI? Microsoft Power BI is a Business Intelligence and Data Visualization tool developed by Microsoft. It helps businesses: โ Connect data โ Clean data โ Analyze data โ Create dashboards โ Share reports ๐ 5. Why Companies Use Data Analytics Companies generate huge amounts of data daily. Examples: โข E-commerce websites โข Banking systems โข Hospitals โข Mobile apps โข Social media platforms Companies analyze data to: โ Increase revenue โ Reduce costs โ Improve customer experience โ Track employee performance โ Predict future trends ๐ 6. Types of Analytics There are 4 major types of analytics. ๐น A. Descriptive Analytics Answers:
โWhat happened?โExample: โข Total sales last month โข Number of customers โข Revenue generated Power BI Usage: โ KPI Cards โ Charts โ Dashboards ๐น B. Diagnostic Analytics Answers:
โWhy did it happen?โExample: โข Why sales dropped? โข Why churn increased? Techniques: โ Drill-down analysis โ Comparisons โ Root-cause analysis ๐น C. Predictive Analytics Answers:
โWhat may happen next?โExample: โข Future sales forecast โข Customer churn prediction Technologies: โ Machine Learning โ AI Models โ Forecasting ๐น D. Prescriptive Analytics Answers:
โWhat should we do?โExample: โข Which marketing strategy to use? โข Which products to stock more? Goal: Recommend actions for better business outcomes. ๐ 7. What are KPIs? KPI = Key Performance Indicator KPIs measure business performance. ๐ Common KPIs: Domain : KPI Examples Sales : Revenue, Profit Marketing : Conversion Rate HR : Employee Attrition Finance : Net Profit Margin ๐ 8. Structured vs Unstructured Data ๐น Structured Data Data stored in rows and columns.
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