Power BI & Tableau Resources
🆓 Resources to learn Power BI, Tableau & Data Visualisation Perfect channel to start learning everything about Data Analytics Admin: @coderfun
Show more📈 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 55 890 subscribers, ranking 3 048 in the Education category and 6 161 in the India region.
📊 Audience metrics and dynamics
Since its creation on невідомо, the project has demonstrated rapid growth, gathering an audience of 55 890 subscribers.
According to the latest data from 05 October, 2026, the channel demonstrates stable activity. Although there has been a change in the number of participants by -6 over the last 30 days and by 4 over the last 24 hours, overall reach remains high.
- Verification status: Not verified
- Engagement rate (ER): The average audience engagement rate is 2.02%. Within the first 24 hours after publication, content typically collects 0.92% reactions from the total number of subscribers.
- Post reach: On average, each post receives 1 129 views. Within the first day, a publication typically gains 514 views.
- Reactions and interaction: The audience actively supports content: the average number of reactions per post is 4.
- Thematic interests: Content is focused on key topics such as dax, visual, dashboard, chart, slicer.
📝 Description and content policy
The author describes the resource as a platform for expressing subjective opinions:
“🆓 Resources to learn Power BI, Tableau & Data Visualisation
Perfect channel to start learning everything about Data Analytics
Admin: @coderfun”
Thanks to the high frequency of updates (latest data received on 06 October, 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.
| is the delimiter. The important concept is that Power BI needs to understand how the file is structured before it can interpret the data correctly.
🔹 Data Types Matter
One of the most important things to check after importing a file is the data type of every column.
For example:
Order ID → Whole Number
Product → Text
Sales Amount → Decimal Number
Order Date → Date
Discount → Decimal Number
Why does this matter?
Suppose Sales Amount is imported as text: "80000", "25000", "75000"
Power BI may not be able to perform numerical calculations correctly until the column is converted to an appropriate numeric type.
🔹 Headers
Power BI also needs to know whether the first row contains column names.
Correct:
OrderID | Product | Amount
1001 | Laptop | 80000
1002 | Monitor | 25000
If Power BI doesn't recognize the first row as headers, it might treat OrderID, Product, Amount as ordinary data. You can correct this during the transformation process.
🔹 Encoding
Text files can use different character encodings. This becomes important when your data contains characters from different languages.
For example: São Paulo, München, 東京, 서울
If the file is interpreted using the wrong encoding, some characters may appear incorrectly. So when working with text-based files, encoding is another thing to be aware of.
🔹 Common Problems with Excel and CSV Data
Real-world files are rarely perfect. You may encounter:
Duplicate records
1001 | Laptop | 80000
1001 | Laptop | 80000
Missing values
1002 | Monitor |
Incorrect data types
"80000", "25000", "75000"
Extra spaces
" Laptop", "Laptop "
Inconsistent values
India, INDIA, india
Different date formats
01/02/2026, 2026-02-01, Feb 1, 2026
These issues are why connecting to a file is only the beginning. The next step is usually data transformation using Power Query.
🔹 Folder Sources
There's another useful scenario. Suppose a company receives one sales file every day:
Sales_01_Sep.csv, Sales_02_Sep.csv, Sales_03_Sep.csv...
Instead of connecting to every file individually, Power BI can connect to the folder containing these files. This becomes extremely useful for recurring file-based reporting.
Power Query can combine files when they follow a consistent structure.
For example:
Daily Files → Sales_01.csv, Sales_02.csv, Sales_03.csv, Sales_04.csv
You can create a process that combines the files into one dataset. This is a very common real-world Power BI scenario.
🎯 Practical Example
Imagine you're given: Monthly_Sales.xlsx
The workbook contains: Sales, Customers, Products, Targets
Your task is to create a sales dashboard. You should first:
1. Connect to the workbook
2. Inspect the available sheets/tables
3. Select the required data
4. Check column names
5. Check data types
6. Look for missing or incorrect values
7. Transform the data where necessary
8. Load the cleaned data into the model
Don't immediately start creating charts. Good Power BI development starts with understanding the data.
💡 Key takeaway: Excel and CSV files may look simple, but they often contain data-quality problems that can affect your entire Power BI report.
Learning to correctly connect, inspect, and prepare file-based data is one of the foundations of becoming good at Power BI.
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1.18 ₽ · /balance_helpOrderID,Product,Region,Amount
1001,Laptop,West,80000
1002,Monitor,South,25000
1003,Laptop,North,75000
Each row generally represents a record, while separators divide the columns.
CSV files are popular because they are:
• Simple
• Lightweight
• Easy to generate
• Supported by many applications
• Easy to exchange between systems
They're commonly used for data exports from applications and databases.
🔹 Delimiters
Although CSV usually means comma-separated, files can use different delimiters.
For example: 1001,Laptop,West,80000 uses commas.
Another file might use: 1001;Laptop;West;80000 using semicolons.
Power BI needs to correctly identify the delimiter so that the columns are separated properly. If the wrong delimiter is selected, the entire row may appear as one column.
🔹 Text Files
Power BI can also connect to text files where data is stored in a structured format.
For example:
1001|Laptop|West|80000
1002|Monitor|South|25000
1003|Laptop|North|75000