Data Science
Open in Telegram
Learn how to analyze data effectively and manage databases with ease. Buy ads: https://telega.io/c/sql_databases
Show more📈 Analytical overview of Telegram channel Data Science
Channel Data Science (@sql_databases) in the English language segment is an active participant. Currently, the community unites 70 805 subscribers, ranking 2 274 in the Education category and 4 582 in the India region.
📊 Audience metrics and dynamics
Since its creation on невідомо, the project has demonstrated rapid growth, gathering an audience of 70 805 subscribers.
According to the latest data from 25 August, 2026, the channel demonstrates stable activity. Although there has been a change in the number of participants by -309 over the last 30 days and by -33 over the last 24 hours, overall reach remains high.
- Verification status: Not verified
- Engagement rate (ER): The average audience engagement rate is 12.05%. Within the first 24 hours after publication, content typically collects 2.78% reactions from the total number of subscribers.
- Post reach: On average, each post receives 8 533 views. Within the first day, a publication typically gains 1 972 views.
- Reactions and interaction: The audience actively supports content: the average number of reactions per post is 0.
- Thematic interests: Content is focused on key topics such as database, learning, linkedin, udemy, 029k|.
📝 Description and content policy
The author describes the resource as a platform for expressing subjective opinions:
“Learn how to analyze data effectively and manage databases with ease.
Buy ads: https://telega.io/c/sql_databases”
Thanks to the high frequency of updates (latest data received on 26 August, 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.
70 805
Subscribers
-3324 hours
-1127 days
-30930 days
Posts Archive
70 805
🔅 How To Be a Lead Data Scientist
📝 Build a foundation and develop skills for seasoned data scientists to level up from model builders to AI leaders.
🌐 Author: Matthew Blasa
🔰 Level: Advanced
⏰ Duration: 1h 6m
📋 Topics: Data Science, Team Management
🔗 Join Data Science for more courses
70 805
😉 A list of the best YouTube videos
✅ To learn data science
1️⃣ SQL language
⬅️ Learning
💰 4-hour SQL course from zero to one hundred
💰 Window functions tutorial
⬅️ Projects
📎 Starting your first SQL project
💰 Data cleansing project
💰 Restaurant order analysis
⬅️ Interview
💰 How to crack the SQL interview?
➖➖➖
2️⃣ Python
⬅️ Learning
💰 12-hour Python for Data Science course
⬅️ Projects
💰 Python project for beginners
💰 Analyzing Corona Data with Python
⬅️ Interview
💰 Python interview golden tricks
💰 Python Interview Questions
➖➖➖
3️⃣ Statistics and machine learning
⬅️ Learning
💰 7-hour course in applied statistics
💰 Machine Learning Training Playlist
⬅️ Projects
💰 Practical ML Project
⬅️ Interview
💰 ML Interview Questions and Answers
💰 How to pass a statistics interview?
➖➖➖
4️⃣ Product and business case studies
⬅️ Learning
💰 Building strong product understanding
💰 Product Metric Definition
⬅️ Interview
💰 Case Study Analysis Framework
💰 How to shine in a business interview?
70 805
📖 Merging and Joining Data
Working with multiple datasets? Combine them just like SQL:
# Inner join (default)
merged = pd.merge(df_sales, df_customers, on='customer_id')
# Left join
pd.merge(df_sales, df_customers, on='customer_id', how='left')
# Concatenate vertically
all_data = pd.concat([df_2023, df_2024], ignore_index=True)
# Join on index
df1.join(df2, on='date')70 805
🔅 Ethical Hacking: SQL Injection
📝 Learn about the SQL command language and SQL injections. Examine SQL injections in MySQL, SQL Server, and Oracle XE, and discover how attackers defeat web application firewalls.
🌐 Author: Malcolm Shore
🔰 Level: Intermediate
⏰ Duration: 1h 45m
📋 Topics: Ethical Hacking, SQL Injection
🔗 Join Data Science for more courses
70 805
+5
SQL is way easier when you actually know what matters.
These are the core basics every beginner needs to build projects, answer real business questions, and stop feeling overwhelmed 📊
Master these first and everything else becomes 10x easier.
Save this to review later ✅
70 805
📖 SQL Learning Roadmap — 8 Key Steps:
1. Basic:
Start by understanding what SQL is, why it’s used, and the different types of SQL commands (DDL, DML, DCL, TCL). This builds your foundation.
2. Queries:
Learn how to fetch data using commands like SELECT, FROM, WHERE, ORDER BY, and LIMIT. Practice filtering data with operators such as =, !=, LIKE, IN, and BETWEEN.
3. Joins:
To work with multiple tables, you must understand INNER, LEFT, RIGHT, and FULL OUTER JOIN. Know how primary and foreign keys relate tables.
4. Functions:
Use built-in functions like COUNT, SUM, AVG, MIN, and MAX for data analysis. Learn how to group data using GROUP BY and filter groups with HAVING.
5. Subqueries:
Write queries within queries! Learn scalar, correlated, and multi-row subqueries. They’re powerful for solving complex data problems.
6. Data Manipulation:
Master how to change data using INSERT, UPDATE, and DELETE. Also, understand transactions using BEGIN, COMMIT, and ROLLBACK to maintain data integrity.
7. Advanced:
Take it further with window functions (ROW_NUMBER, RANK, LEAD, LAG), CTEs (WITH), views, and indexing to write efficient and optimized queries.
8. Practice:
The final step is consistent practice. Work with real-world datasets, focus on query optimization, and solve challenges on platforms like LeetCode, Mode, or HackerRank.
70 805
Read this once. There won't be a second message.
Brainlancer just launched today.
Investor-backed marketplace for ALL AI freelancers. Designers, builders, copywriters, marketers, video creators, automation experts, consultants.
If you build, design, write, or sell anything with AI, this is your moment.
How it works:
• Register free at brainlancer.com
• Stripe verification, 5 minutes, instant approval
• List up to 5 services from $49 to $4,999
• Add monthly subscriptions on top if you want
• We bring the clients. You keep 80%.
The deal:
No subscription.
No bidding.
No chasing.
We pay all marketing.
Real talk: no services live yet. We just launched. Whoever joins first gets seen first.
The first 100 Brainlancers are onboarding right now.
In 6 months others will have founding status, recurring income, featured services on the homepage.
You'll scroll past and remember this post.
Don't.
→ brainlancer.com
70 805
🔅 The 80/20 Rule of Data Science
📝 Explore the core concepts of the 80/20 rule for data science and how to get most of the value with minimal effort.
🌐 Author: Howard Friedman
🔰 Level: Intermediate
⏰ Duration: 1h 26m
📋 Topics: Data Science, Project Engineering, Team Management
🔗 Join Data Science for more courses
70 805
📖 MOST COMMON SQL INTERVIEW QUESTION
Do you knew this?
👉 “What is the order of execution in an SQL query?”
Don’t let the SELECT fool you – it’s NOT the first step! 😮
Here’s the correct order that SQL follows behind the scenes:
🔢 SQL Order of Execution:
1️⃣ FROM
2️⃣ JOIN
3️⃣ WHERE
4️⃣ GROUP BY
5️⃣ HAVING
6️⃣ SELECT
7️⃣ DISTINCT
8️⃣ ORDER BY
9️⃣ LIMIT / OFFSET
🔥 Pro tip: Interviewers LOVE this question to test your SQL fundamentals!
Memorize it, understand it – and impress in your next interview. 💼
70 805
🔅 PostgreSQL Essential Training
📝 Learn how to set up and work with one of the worlds most popular open-source database platforms, PostgreSQL.
🌐 Author: Adam Wilbert
🔰 Level: Intermediate
⏰ Duration: 3h 18m
📋 Topics: PostgreSQL
🔗 Join Data Science for more courses
