Available now! Telegram Research 2025 โ the year's key insights 
Coding Interview Resources
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This channel contains the free resources and solution of coding problems which are usually asked in the interviews. Managed by: @love_data
Show more๐ Analytical overview of Telegram channel Coding Interview Resources
Channel Coding Interview Resources (@crackingthecodinginterview) in the English language segment is an active participant. Currently, the community unites 52 109 subscribers, ranking 2 562 in the Technologies & Applications category and 6 971 in the India region.
๐ Audience metrics and dynamics
Since its creation on ะฝะตะฒัะดะพะผะพ, the project has demonstrated rapid growth, gathering an audience of 52 109 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 82 over the last 30 days and by -17 over the last 24 hours, overall reach remains high.
- Verification status: Not verified
- Engagement rate (ER): The average audience engagement rate is 1.88%. Within the first 24 hours after publication, content typically collects 0.36% reactions from the total number of subscribers.
- Post reach: On average, each post receives 980 views. Within the first day, a publication typically gains 186 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 array, stack, algorithm, programming, sort.
๐ Description and content policy
The author describes the resource as a platform for expressing subjective opinions:
โThis channel contains the free resources and solution of coding problems which are usually asked in the interviews.
Managed by: @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.
52 109
Subscribers
-1724 hours
-857 days
+8230 days
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Channel Posts
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Crack interviews by thinking like a data analyst, not just a tool user ๐
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๐ Remove unused columns & tables
๐ Prefer measures over calculated columns
๐ Optimize relationships (avoid many-to-many if possible)
๐ Reduce visuals & use aggregations
๐ Switch to Import mode if feasible
๐ Q2. Business wants a dynamic Top N filter (e.g., Top 5 / Top 10 products). How will you build it?
๐ Create a parameter table (Top N values)
๐ Use DAX with RANKX / TOPN
๐ Apply it in visual-level filters
๐ Connect parameter with slicer for dynamic control
๐ Q3. Different users should only see their own regionโs data. Whatโs your approach?
๐ Implement Row-Level Security (RLS)
๐ Create roles based on region
๐ Map users to roles in Power BI Service
๐ Q4. You need to compare current sales with last year. How would you do it?
๐ Create a date table (important!)
๐ Use DAX like SAMEPERIODLASTYEAR
๐ Build measures for current vs previous year
๐ Visualize using line/bar charts
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| 3 |  ๐ณ ๐๐ฅ๐๐ ๐๐ฒ๐ฟ๐๐ถ๐ณ๐ถ๐ฐ๐ฎ๐๐ถ๐ผ๐ป ๐๐ผ๐๐ฟ๐๐ฒ๐ ๐ง๐ผ ๐๐ป๐ฟ๐ผ๐น๐น ๐๐ป ๐ฎ๐ฌ๐ฎ๐ฒ๐ย
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| 4 |  ๐ฐ What is a binary search??
Binary search is a search algorithm used to find the position of a target value within a sorted array.
It works by repeatedly dividing the search interval in half. At each step, it compares the target value with the middle element of the array.
If the target value matches the middle element, the position is returned. If the target value is less than the middle element, the search continues on the lower half of the array. If the target value is greater, the search continues on the upper half.
This process continues until the target value is found or the search interval is empty. Binary search is efficient and has a time complexity of O(log n), where n is the number of elements in the array. | 598 |
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| 6 | โ
Top Web Development Interview Questions & Answers ๐๐ป
๐ 1. What is the difference between Frontend and Backend development?
Answer: Frontend deals with the part of the website users interact with (UI/UX), using HTML, CSS, JavaScript frameworks like React or Vue. Backend handles server-side logic, databases, and APIs using languages like Node.js, Python, or PHP.
๐ 2. What is REST and why is it important?
Answer: REST (Representational State Transfer) is an architectural style for designing APIs. It uses HTTP methods (GET, POST, PUT, DELETE) to manipulate resources and enables communication between client and server efficiently.
๐ 3. Explain the concept of Responsive Design.
Answer: Responsive Design ensures web pages render well on various devices and screen sizes by using flexible grids, images, and CSS media queries.
๐ 4. What are CSS Flexbox and Grid?
Answer: Both are CSS layout modules. Flexbox is for one-dimensional layouts (row or column), while Grid manages two-dimensional layouts (rows and columns), simplifying complex page structures.
๐ 5. What is the Virtual DOM in React?
Answer: A lightweight copy of the real DOM that React uses to efficiently update only parts of the UI that changed, improving performance.
๐ 6. How do you handle authentication in web applications?
Answer: Common methods include sessions with cookies, tokens like JWT, OAuth, or third-party providers (Google, Facebook).
๐ 7. What is CORS and how do you handle it?
Answer: Cross-Origin Resource Sharing (CORS) is a security feature blocking requests from different origins. Handled by setting appropriate headers on the server to allow trusted domains.
๐ 8. Explain Event Loop and Asynchronous programming in JavaScript.
Answer: Event Loop allows JavaScript to perform non-blocking actions by handling callbacks, promises, and async/await, enabling concurrency even though JS is single-threaded.
๐ 9. What is the difference between SQL and NoSQL databases?
Answer: SQL databases are relational, use structured schemas with tables (e.g., MySQL). NoSQL databases are non-relational, schema-flexible, and handle unstructured data (e.g., MongoDB).
๐ ๐ What are WebSockets?
Answer: WebSockets provide full-duplex communication channels over a single TCP connection, enabling real-time data flow between client and server.
๐ก Pro Tip: Back answers with examples or a small snippet, and relate them to projects youโve built. Be ready to explain trade-offs between technologies.
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| 7 |  ๐๐ฐ๐ฐ๐ฒ๐ป๐๐๐ฟ๐ฒ ๐๐ฅ๐๐ ๐ฉ๐ถ๐ฟ๐๐๐ฎ๐น ๐๐ป๐๐ฒ๐ฟ๐ป๐๐ต๐ถ๐ฝ ๐ณ๐ผ๐ฟ ๐๐ฎ๐๐ฎ ๐๐ป๐ฎ๐น๐๐๐ถ๐ฐ๐ ๐๐ถ๐๐ต ๐๐ฟ๐ฒ๐ฒ ๐๐ฒ๐ฟ๐๐ถ๐ณ๐ถ๐ฐ๐ฎ๐๐ฒ ๐
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๐ฅ Start your Data Analytics journey today and gain valuable virtual internship experience from a top global company. | 352 |
| 8 | SQL interview questions with answers ๐๐
1. Question: What is SQL?
Answer: SQL (Structured Query Language) is a programming language designed for managing and manipulating relational databases. It is used to query, insert, update, and delete data in databases.
2. Question: Differentiate between SQL and MySQL.
Answer: SQL is a language for managing relational databases, while MySQL is an open-source relational database management system (RDBMS) that uses SQL as its language.
3. Question: Explain the difference between INNER JOIN and LEFT JOIN.
Answer: INNER JOIN returns rows when there is a match in both tables, while LEFT JOIN returns all rows from the left table and the matched rows from the right table, filling in with NULLs for non-matching rows.
4. Question: How do you remove duplicate records from a table?
Answer: Use the DISTINCT keyword in a SELECT statement to retrieve unique records. For example: SELECT DISTINCT column1, column2 FROM table;
5. Question: What is a subquery in SQL?
Answer: A subquery is a query nested inside another query. It can be used to retrieve data that will be used in the main query as a condition to further restrict the data to be retrieved.
6. Question: Explain the purpose of the GROUP BY clause.
Answer: The GROUP BY clause is used to group rows that have the same values in specified columns into summary rows, like when using aggregate functions such as COUNT, SUM, AVG, etc.
7. Question: How can you add a new record to a table?
Answer: Use the INSERT INTO statement. For example: INSERT INTO table_name (column1, column2) VALUES (value1, value2);
8. Question: What is the purpose of the HAVING clause?
Answer: The HAVING clause is used in combination with the GROUP BY clause to filter the results of aggregate functions based on a specified condition.
9. Question: Explain the concept of normalization in databases.
Answer: Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity. It involves breaking down tables into smaller, related tables.
10. Question: How do you update data in a table in SQL?
Answer: Use the UPDATE statement to modify existing records in a table. For example: UPDATE table_name SET column1 = value1 WHERE condition;
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| 10 | โ
JavaScript Practice Questions with Answers ๐ปโก
๐ Q1. How do you check if a number is even or odd?
let num = 10;
if (num % 2 === 0) {
console.log("Even");
} else {
console.log("Odd");
}
๐ Q2. How do you reverse a string?
let text = "hello";
let reversedText = text.split("").reverse().join("");
console.log(reversedText); // Output: olleh
๐ Q3. Write a function to find the factorial of a number.
function factorial(n) {
let result = 1;
for (let i = 1; i <= n; i++) {
result *= i;
}
return result;
}
console.log(factorial(5)); // Output: 120
๐ Q4. How do you remove duplicates from an array?
let items = [1, 2, 2, 3, 4, 4];
let uniqueItems = [...new Set(items)];
console.log(uniqueItems);
๐ Q5. Print numbers from 1 to 10 using a loop.
for (let i = 1; i <= 10; i++) {
console.log(i);
}
๐ Q6. Check if a word is a palindrome.
let word = "madam";
let reversed = word.split("").reverse().join("");
if (word === reversed) {
console.log("Palindrome");
} else {
console.log("Not a palindrome");
}
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| 12 | ๐ง Core Programming Concepts You Should Know ๐ป๐
These are the fundamental ideas behind all programming languages.
Understanding them properly builds strong logic and problem-solving skills.
Programming
Programming is the process of writing instructions that a computer can understand and execute. These instructions are written using programming languages like Python, JavaScript, Java, C++, etc.
The goal of programming is to:
- automate tasks
- process data
- build software applications
- control systems and devices
In simple terms, programming tells a computer what to do and how to do it.
Algorithm
An algorithm is a step-by-step method to solve a problem. It focuses on the logic behind solving a problem rather than the specific programming language.
Good algorithms should be:
- Correct โ produce the right output
- Efficient โ use minimal time and memory
- Clear โ easy to understand
For example, searching for a number in a list or sorting data are common algorithm problems.
Flowchart
A flowchart is a diagram that visually represents the logic of a program. Instead of writing code directly, developers sometimes design the program flow using diagrams.
Common flowchart elements include:
- Start / End symbols
- Process blocks
- Decision blocks
- Arrows showing execution flow
Flowcharts help in planning program logic before coding.
Syntax
Syntax refers to the rules that define how code must be written in a programming language. Every programming language has its own syntax. If syntax rules are violated, the program will produce a syntax error and will not run.
Examples of syntax rules include:
- correct use of keywords
- proper structure of statements
- correct punctuation and formatting
Learning syntax is similar to learning the grammar of a language.
Compilation
Compilation is the process of converting human-readable source code into machine code before execution. This is done by a program called a compiler.
Languages that use compilation include:
- C
- C++
- Go
- Rust
Compiled programs usually run faster because the code is already translated into machine instructions.
Interpretation
Interpretation is the process of executing code line by line using an interpreter instead of converting it beforehand. The interpreter reads the code and executes each instruction immediately.
Languages that commonly use interpretation include:
- Python
- JavaScript
- Ruby
Interpreted languages are often easier for beginners because they allow quick testing and debugging.
โญ Key Idea
Programming concepts like algorithms, syntax, compilation, and interpretation form the foundation of software development. Once these basics are clear, learning any programming language becomes much easier.
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| 13 |  ๐ ๐๐ถ๐๐ฐ๐ผ ๐๐ฅ๐๐ ๐๐ฎ๐๐ฎ ๐๐ป๐ฎ๐น๐๐๐ถ๐ฐ๐ ๐๐ฒ๐ฟ๐๐ถ๐ณ๐ถ๐ฐ๐ฎ๐๐ถ๐ผ๐ป | ๐๐ป๐ฟ๐ผ๐น๐น ๐ก๐ผ๐! ๐
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| 14 | ๐ง SQL Interview Question (ModerateโTricky & Duplicate Transaction Detection)
๐
transactions(transaction_id, user_id, transaction_date, amount)
โ Ques :
๐ Find users who made multiple transactions with the same amount consecutively.
๐งฉ How Interviewers Expect You to Think
โข Sort transactions chronologically for each user
โข Compare the current transaction amount with the previous one
โข Use a window function to detect consecutive duplicates
๐ก SQL Solution
SELECT
user_id,
transaction_date,
amount
FROM (
SELECT
user_id,
transaction_date,
amount,
LAG(amount) OVER (
PARTITION BY user_id
ORDER BY transaction_date
) AS prev_amount
FROM transactions
) t
WHERE amount = prev_amount;
๐ฅ Why This Question Is Powerful
โข Tests understanding of LAG() for row comparison
โข Evaluates ability to identify patterns in sequential data
โข Reflects real-world use cases like detecting suspicious or duplicate transactions
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| 17 | โ
Where to Apply for Web Development Jobs ๐ป๐
Hereโs a list of the best platforms to find web dev jobs, internships, and freelance gigs:
๐น Job Portals (Full-time/Internships)
1. LinkedIn โ Top platform for tech hiring
2. Indeed โ Good for local & remote jobs
3. Glassdoor โ Job search + company reviews
4. Naukri.com โ Popular in India
5. Monster โ Global listings
6. Internshala โ Internships & fresher roles
๐น Tech-Specific Platforms
1. Hirect App โ Direct chat with startup founders/recruiters
2. AngelList / Wellfound โ Startup jobs (remote/flexible)
3. Stack Overflow Jobs โ Developer-focused listings
4. Turing / Toptal โ Remote global jobs (for skilled devs)
๐น Freelancing Platforms
1. Upwork โ Projects from all industries
2. Fiverr โ Set your own gigs (great for beginners)
3. Freelancer.com โ Bidding-based freelance jobs
4. PeoplePerHour โ Short-term dev projects
๐น Social Media Platforms
There are many WhatsApp & Telegram channels which post daily job updates. Here are some of the most popular job channels:
Telegram channels:
https://t.me/getjobss
https://t.me/FAANGJob
https://t.me/internshiptojobs
https://t.me/jobs_us_uk
WhatsApp Channels:
https://whatsapp.com/channel/0029Vb1raTiDjiOias5ARu2p
https://whatsapp.com/channel/0029VaxngnVInlqV6xJhDs3m
https://whatsapp.com/channel/0029VatL9a22kNFtPtLApJ2L
https://whatsapp.com/channel/0029VaxtmHsLikgJ2VtGbu1R
https://whatsapp.com/channel/0029Vb4n3QZFy72478wwQp3n
https://whatsapp.com/channel/0029VbAOss8EKyZK7GryN63V
https://whatsapp.com/channel/0029Vb1RrFuC1Fu3E0aiac2E
https://whatsapp.com/channel/0029Vb8pF9b65yDKZxIAy83b
https://whatsapp.com/channel/0029Vb9CzaNCcW4yxgR1jX3S
๐น Others Worth Exploring
- Remote OK / We Work Remotely โ Remote jobs
- Jobspresso / Remotive โ Remote tech-focused roles
- Hashnode / Dev.to โ Community + job listings
๐ก Tip: Always keep your LinkedIn & GitHub updated. Many recruiters search there directly!
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| 19 | โ
Core SQL Interview Questions With Answers ๐ฅ๏ธ
1 What is SQL
โข SQL stands for Structured Query Language
โข You use it to read and manage data in relational databases
โข Used in MySQL, PostgreSQL, SQL Server, Oracle
2 What is an RDBMS
โข Relational Database Management System
โข Stores data in tables with rows and columns
โข Uses keys to link tables
โข Example. Customer table linked to Orders table using customer_id
3 What is a table
โข Structured storage for data
โข Rows are records
โข Columns are attributes
โข Example. One row equals one customer
4 What is a primary key
โข Uniquely identifies each row
โข Cannot be NULL
โข No duplicate values
โข Example. user_id in users table
5 What is a foreign key
โข Links one table to another
โข Refers to a primary key in another table
โข Allows duplicate values
โข Example. user_id in orders table
6 Difference between primary key and foreign key
โข Primary key ensures uniqueness
โข Foreign key ensures relationship
โข One table can have one primary key
โข One table can have multiple foreign keys
7 What is NULL
โข Represents missing or unknown value
โข Not equal to zero or empty string
โข Use IS NULL or IS NOT NULL to check
8 What are constraints
โข Rules applied on columns
โข Maintain data quality
โข Common constraints
โ NOT NULL
โ UNIQUE
โ PRIMARY KEY
โ FOREIGN KEY
โ CHECK
9 What are data types
โข Define type of data stored
โข Common types
โ INT for numbers
โ VARCHAR for text
โ DATE for dates
โ FLOAT or DECIMAL for decimals
10 Interview tip you must remember
โข Always explain with a small example
โข Speak logic before syntax
โข Keep answers short and direct
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