Power BI & Tableau Resources
🆓 Resources to learn Power BI, Tableau & Data Visualisation Perfect channel to start learning everything about Data Analytics Admin: @coderfun
Mostrar más📈 Análisis del canal de Telegram Power BI & Tableau Resources
El canal Power BI & Tableau Resources (@powerbi_analyst) en el segmento lingüístico de Inglés es un actor destacado. Actualmente la comunidad reúne a 55 458 suscriptores, ocupando la posición 3 073 en la categoría Educación y el puesto 6 602 en la región India.
📊 Métricas de audiencia y dinámica
Desde su creación el невідомо, el proyecto ha mostrado un crecimiento acelerado, reuniendo a 55 458 suscriptores.
Según los últimos datos del 13 junio, 2026, el canal mantiene una actividad estable. En los últimos 30 días la variación de miembros fue de 308, y en las últimas 24 horas de 37, conservando un alto alcance.
- Estado de verificación: No verificado
- Tasa de interacción (ER): El promedio de interacción de la audiencia es 2.54%. Durante las primeras 24 horas tras publicar, el contenido suele obtener 1.00% de reacciones respecto al total de suscriptores.
- Alcance de las publicaciones: Cada publicación recibe en promedio 1 406 visualizaciones. En el primer día suele acumular 553 visualizaciones.
- Reacciones e interacción: La audiencia responde de forma activa: el promedio de reacciones por publicación es 3.
- Intereses temáticos: El contenido se centra en temas clave como dax, visual, dashboard, chart, slicer.
📝 Descripción y política de contenido
El autor describe el recurso como un espacio para expresar opiniones subjetivas:
“🆓 Resources to learn Power BI, Tableau & Data Visualisation
Perfect channel to start learning everything about Data Analytics
Admin: @coderfun”
Gracias a la alta frecuencia de actualizaciones (últimos datos recibidos el 14 junio, 2026), el canal mantiene la vigencia y un amplio alcance. La analítica demuestra que la audiencia interactúa activamente con el contenido, lo que lo convierte en un punto de referencia dentro de la categoría Educación.
SELECT * FROM Orders
WHERE Sales > (SELECT AVG(Sales) FROM Orders);
📌 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;
👉 Very common in Data Analyst interviews.
📌 15. Window Functions (IMPORTANT)
ROW_NUMBER(): Assigns unique numbers
RANK(): Ranks with gaps
DENSE_RANK(): Ranks without gaps
📌 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;
📌 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?
📌 18. SQL Project
🛒 E-Commerce Sales Analysis
Tables: Customers, Orders, Products
Tasks:
✔ Total Revenue,
✔ Top Products,
✔ Monthly Sales,
✔ Region Analysis,
✔ Customer Analysis
📌 19. Common SQL Mistakes
❌ Missing JOIN conditions
❌ Using SELECT * everywhere
❌ Ignoring NULL values
❌ Not using aliases
❌ Poor filtering
🎯 Goal of This Topic
After completing SQL, you should be able to:
✅ Query databases confidently
✅ Use JOINS effectively
✅ Aggregate business data
✅ Solve interview questions
✅ Prepare data for Power BI
Double Tap ❤️ For More
-----
1.19 ₽ · /balance_helpSELECT *
FROM Customers;
Output: Returns all columns.
Select Specific Columns
SELECT Name, City
FROM Customers;
👉 Most commonly used SQL statement.
📌 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';
📌 6. ORDER BY
Sorts data.
Ascending:
SELECT * FROM Orders ORDER BY Sales ASC;
Descending:
SELECT * FROM Orders ORDER BY Sales DESC;
📌 7. DISTINCT
Removes duplicate values.
Example:
SELECT DISTINCT Region FROM Customers;
Output: Unique regions only.
📌 8. Aggregate Functions
Used to summarize data.
COUNT: SELECT COUNT(*) FROM Orders; → Counts rows.
SUM: SELECT SUM(Sales) FROM Orders; → Calculates total sales.
AVG: SELECT AVG(Sales) FROM Orders; → Calculates average sales.
MIN: SELECT MIN(Sales) FROM Orders; → Smallest value.
MAX: SELECT MAX(Sales) FROM Orders; → Largest value.
📌 9. GROUP BY
Used for aggregation by category.
Example:
SELECT Region, SUM(Sales) AS TotalSales
FROM Orders
GROUP BY Region;
Output:
Region : TotalSales → North : 50000, South : 70000
📌 10. HAVING
Filters grouped data.
Example:
SELECT Region, SUM(Sales)
FROM Orders
GROUP BY Region
HAVING SUM(Sales) > 50000;
👉 HAVING works after GROUP BY.
📌 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
📌 12. CASE WHEN
Used like IF statements.
SELECT Product,
CASE WHEN Sales > 10000 THEN 'High' ELSE 'Low' END AS Category
FROM Orders;
📌 13. Subqueries
Query inside another query.Using data to make smarter business decisions.BI helps companies: • Analyze sales • Monitor performance • Track KPIs • Predict trends • Improve profits 📌 4. What is Power BI? Microsoft Power BI is a Business Intelligence and Data Visualization tool developed by Microsoft. It helps businesses: ✔ Connect data ✔ Clean data ✔ Analyze data ✔ Create dashboards ✔ Share reports 📌 5. Why Companies Use Data Analytics Companies generate huge amounts of data daily. Examples: • E-commerce websites • Banking systems • Hospitals • Mobile apps • Social media platforms Companies analyze data to: ✅ Increase revenue ✅ Reduce costs ✅ Improve customer experience ✅ Track employee performance ✅ Predict future trends 📌 6. Types of Analytics There are 4 major types of analytics. 🔹 A. Descriptive Analytics Answers:
“What happened?”Example: • Total sales last month • Number of customers • Revenue generated Power BI Usage: ✔ KPI Cards ✔ Charts ✔ Dashboards 🔹 B. Diagnostic Analytics Answers:
“Why did it happen?”Example: • Why sales dropped? • Why churn increased? Techniques: ✔ Drill-down analysis ✔ Comparisons ✔ Root-cause analysis 🔹 C. Predictive Analytics Answers:
“What may happen next?”Example: • Future sales forecast • Customer churn prediction Technologies: ✔ Machine Learning ✔ AI Models ✔ Forecasting 🔹 D. Prescriptive Analytics Answers:
“What should we do?”Example: • Which marketing strategy to use? • Which products to stock more? Goal: Recommend actions for better business outcomes. 📌 7. What are KPIs? KPI = Key Performance Indicator KPIs measure business performance. 📊 Common KPIs: Domain : KPI Examples Sales : Revenue, Profit Marketing : Conversion Rate HR : Employee Attrition Finance : Net Profit Margin 📌 8. Structured vs Unstructured Data 🔹 Structured Data Data stored in rows and columns.
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