Data Analytics
Perfect channel to learn Data Analytics Learn SQL, Python, Alteryx, Tableau, Power BI and many more For Promotions: @coderfun @love_data
Show more๐ Analytical overview of Telegram channel Data Analytics
Channel Data Analytics (@sqlspecialist) in the English language segment is an active participant. Currently, the community unites 109 588 subscribers, ranking 1 126 in the Technologies & Applications category and 2 339 in the India region.
๐ Audience metrics and dynamics
Since its creation on ะฝะตะฒัะดะพะผะพ, the project has demonstrated rapid growth, gathering an audience of 109 588 subscribers.
According to the latest data from 23 June, 2026, the channel demonstrates stable activity. Although there has been a change in the number of participants by 529 over the last 30 days and by 20 over the last 24 hours, overall reach remains high.
- Verification status: Not verified
- Engagement rate (ER): The average audience engagement rate is 2.83%. Within the first 24 hours after publication, content typically collects 0.72% reactions from the total number of subscribers.
- Post reach: On average, each post receives 3 097 views. Within the first day, a publication typically gains 784 views.
- Reactions and interaction: The audience actively supports content: the average number of reactions per post is 8.
- Thematic interests: Content is focused on key topics such as row, sql, analytic, analyst, visualization.
๐ Description and content policy
The author describes the resource as a platform for expressing subjective opinions:
โPerfect channel to learn Data Analytics
Learn SQL, Python, Alteryx, Tableau, Power BI and many more
For Promotions: @coderfun @love_dataโ
Thanks to the high frequency of updates (latest data received on 24 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 Technologies & Applications category.
sales = {"January": 12000, "February": 15000, "March": 17000}
print(sales["February"]) # Output: 15000
4. Explain the difference between a list and a tuple in Python.
- List: Mutable, meaning you can modify (add, remove, or change) elements. Itโs written in square brackets [ ].
Example:
my_list = [10, 20, 30]
my_list.append(40)
- Tuple: Immutable, meaning once defined, you cannot modify it. Itโs written in parentheses ( ).
Example:
my_tuple = (10, 20, 30)
5. How would you handle missing data in a dataset using Python?
Handling missing data is critical in data analysis, and Pythonโs Pandas library makes it easy. Here are some common methods:
- Drop missing data:
df.dropna()
- Fill missing data with a specific value:
df.fillna(0)
- Forward-fill or backfill missing values:
df.fillna(method='ffill') # Forward-fill
df.fillna(method='bfill') # Backfill
6. How do you merge/join two datasets in Python?
- pd.merge(): For SQL-style joins (inner, outer, left, right).
df_merged = pd.merge(df1, df2, on='common_column', how='inner')
- pd.concat(): For concatenating along rows or columns.
df_concat = pd.concat([df1, df2], axis=1)
7. What is the purpose of lambda functions in Python?
A lambda function is an anonymous, single-line function that can be used for quick, simple operations. They are useful when you need a short, throwaway function.
Example:
add = lambda x, y: x + y
print(add(10, 20)) # Output: 30
Lambdas are often used in data analysis for quick transformations or filtering operations within functions like map() or filter().
If youโre preparing for interviews, focus on writing clean, optimized code and understand how Python fits into the larger data ecosystem.
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Share with credits: https://t.me/sqlspecialist
Hope it helps :)CREATE DATABASE db_name;
- USE db_name;
2. Tables
- Create Table: CREATE TABLE table_name (col1 datatype, col2 datatype);
- Drop Table: DROP TABLE table_name;
- Alter Table: ALTER TABLE table_name ADD column_name datatype;
3. Insert Data
- INSERT INTO table_name (col1, col2) VALUES (val1, val2);
4. Select Queries
- Basic Select: SELECT * FROM table_name;
- Select Specific Columns: SELECT col1, col2 FROM table_name;
- Select with Condition: SELECT * FROM table_name WHERE condition;
5. Update Data
- UPDATE table_name SET col1 = value1 WHERE condition;
6. Delete Data
- DELETE FROM table_name WHERE condition;
7. Joins
- Inner Join: SELECT * FROM table1 INNER JOIN table2 ON table1.col = table2.col;
- Left Join: SELECT * FROM table1 LEFT JOIN table2 ON table1.col = table2.col;
- Right Join: SELECT * FROM table1 RIGHT JOIN table2 ON table1.col = table2.col;
8. Aggregations
- Count: SELECT COUNT(*) FROM table_name;
- Sum: SELECT SUM(col) FROM table_name;
- Group By: SELECT col, COUNT(*) FROM table_name GROUP BY col;
9. Sorting & Limiting
- Order By: SELECT * FROM table_name ORDER BY col ASC|DESC;
- Limit Results: SELECT * FROM table_name LIMIT n;
10. Indexes
- Create Index: CREATE INDEX idx_name ON table_name (col);
- Drop Index: DROP INDEX idx_name;
11. Subqueries
- SELECT * FROM table_name WHERE col IN (SELECT col FROM other_table);
12. Views
- Create View: CREATE VIEW view_name AS SELECT * FROM table_name;
- Drop View: DROP VIEW view_name;
Here you can find SQL Interview Resources๐
https://t.me/DataSimplifier
Share with credits: https://t.me/sqlspecialist
Hope it helps :)
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