Gallagher Interview Questions, Process, and Tips for Experienced

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Q1. She was very friendly, basic questions what do you do and all .
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Q1. What is node.js
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Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine that allows developers to run JavaScript on the server side.
• Node.js is open-source and cross-platform.

• It is commonly used for building scalable network applications.

• Node.js uses an event-driven, non-blocking I/O model.

• Example: Creating a simple web server using Node.js.
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Q2. What is the event loop in Node.js?
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The event loop in Node.js is a mechanism that allows Node.js to perform non-blocking I/O operations.
• The event loop is responsible for handling asynchronous operations in Node.js.

• It allows Node.js to perform I/O operations without blocking the execution of other code.

• The event loop continuously checks for tasks in the event queue and executes them in a non-blocking manner.

• Callbacks are used to handle the completion of a
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Q1. Types of sql joins
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SQL joins combine rows from two or more tables based on related columns, enabling complex queries and data retrieval.
• INNER JOIN: Returns records with matching values in both tables. Example: SELECT * FROM A INNER JOIN B ON A.id = B.id;

• LEFT JOIN: Returns all records from the left table and matched records from the right table. Example: SELECT * FROM A LEFT JOIN B ON A.id = B.id;

• RIGHT JOIN: Returns all records from the r...read more
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Q2. What is having clause
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HAVING clause filters records after GROUP BY, allowing conditions on aggregated data in SQL queries.
• Used in SQL to filter results of aggregate functions like COUNT, SUM, AVG.

• Example: SELECT department, COUNT(*) FROM employees GROUP BY department HAVING COUNT(*) > 10;

• It follows the GROUP BY clause in a SQL statement.

• Allows for conditions on grouped data, unlike WHERE which filters before grouping.
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It's good but it was difficult

Q1. I didn't select for hr round
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Q2. I don't know about hr round
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Q1. I didn't select for manager round
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Q2. I don't know about that
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Q3. I don't know how is it
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Q4. Sorry I don't know about that
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