Global Edge Software Data Analyst Interview Questions and Answers

Q1. What data structure is used to implement a priority queue?
Ans. 
Binary heap is used to implement a priority queue.
• Binary heap is a complete binary tree where each node has a value greater than or equal to its children.

• It can be implemented using arrays, where the parent of node at index i is at index (i-1)/2.

• Insertion and deletion operations have time complexity of O(log n) in a binary heap.
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Q2. How many trees will a binary tree have?
Ans. 
A binary tree can have any number of nodes, but the maximum number of trees with n nodes is 2^n.
• A binary tree can have 0 nodes, 1 node, 2 nodes, or any number of nodes.

• The maximum number of binary trees with n nodes is 2^n.

• For example, a binary tree with 3 nodes can have up to 8 different structures.
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Q1. SQL Query to return the second highest marks in a student database
Ans. 
Use a SQL query to find the second highest marks in a student database.
• Use the ORDER BY clause to sort the marks in descending order

• Use the LIMIT clause to limit the result to the second row
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Q2. Program to check if two strings are anagrams
Ans. 
Program to check if two strings are anagrams
• Create a function that takes in two strings as input

• Remove any spaces and convert both strings to lowercase for consistency

• Sort the characters in both strings and compare if they are equal to determine if they are anagrams

• Example: 'listen' and 'silent' are anagrams
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Q1. Tell Me about yourself and ice breaker questions
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Q2. About Excel pivot table vlookup charts and SQL joins extraction questions
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Q1. Normal Behavioral questions
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Q1. About educational Background and usual HR questions
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My SQL query working fetching to data

Programming and data query fetching

Q1. I am fresher so handling to mistake in my language
Ans. Becouse ia am fresher in interview
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Q2. I am not a experience to the interview
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2 questions based on coding

Q1. Reverse a string
Ans. 
Reverse a given string
• Use built-in functions like reverse() or slice() in Python

• Iterate through the string in reverse order and append each character to a new string

• Convert the string to an array of characters, reverse the array, then join the characters back together
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Q2. Linked list in java
Ans. 
A linked list is a data structure in Java where each element points to the next element in the list.
• Linked list nodes contain data and a reference to the next node

• Insertion and deletion operations are efficient in linked lists

• Traversal requires iterating through each node starting from the head

• Example: Node class with data and next pointer, LinkedList class with methods to insert, delete, and traverse
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Q1. Motivational questions about why you want to join company and previous experiences
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Q1. Solve some sql queries
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