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Aggregate functions in SQL are used to perform calculations on a set of values and return a single value.
Aggregate functions include SUM, AVG, COUNT, MIN, and MAX.
They are often used with the GROUP BY clause to group the results based on certain criteria.
Examples: SELECT SUM(sales) FROM orders; SELECT AVG(age) FROM employees GROUP BY department;
Aggregate functions ignore NULL values unless specified.
Top trending discussions
I was interviewed before May 2022.
Postgres Architecture is a client-server model with a multi-process approach.
Postgres uses a multi-process approach with a master process and worker processes.
The master process manages shared memory and worker processes handle client connections.
Postgres also has a background process for maintenance tasks and a WAL writer for data durability.
Postgres supports ACID transactions and has a query planner for optimizing qu...
I applied via Walk-in and was interviewed before Jan 2021. There were 4 interview rounds.
I applied via Campus Placement and was interviewed before Sep 2020. There was 1 interview round.
I applied via Walk-in and was interviewed before Nov 2022. There were 5 interview rounds.
Maths, logical question & some related to programming
One problem statement to write a program.
I applied via Company Website and was interviewed before Oct 2023. There were 2 interview rounds.
MCQ type questions answers
I applied via Company Website and was interviewed in Apr 2022. There were 6 interview rounds.
Naaptol
Naaptol
Naaptol
Study ing information
I applied via Campus Placement and was interviewed in Jun 2022. There were 5 interview rounds.
50 mcq were asked in 12 mins. Most of the candidates qualified this round.
3 coding questions of basic DSA were asked. Also few mcqs from Operating System, Networking and DBMS.
I applied via Naukri.com and was interviewed before Oct 2022. There were 4 interview rounds.
15 minutes test.
50 questions
easy questions
Management , Leadership , Character Type questions
2 coding questions
resume grilling
easy medium questions
based on 1 interview
Interview experience
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