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The sum of alternate elements has various real-life applications such as signal processing, data compression, pattern recognition, gaming, and financial data analysis. Problem Description In this article, we are going to learn how to find the sum of alternate elements of an array in C++. Alternate elements are present at even or odd indices of the array, depending on how we define them. Example 1 Inputarray = [1, 2, 3, 4, 5] OutputSum_even = 9Sum_odd = 6 Explanation The alternate elements at the even index are 1, 3, 5 (at ... Read More
To search for an element in a linked list, we need to go through each node one by one and check if its value matches the target element. If we find the element, we return its position in the list. If not, we return a message saying the element is not found. In this article, our task is to implement a JavaScript program that searches for a specific element in a linked list and returns its position if found, or a message if it is not present. Example Let's look at the below examples: Linked list: 10 -> ... Read More
SQL (Structured Query Language) is a programming language used to manage and interact with databases. In this case, the goal is to find the highest salary in each department from a table that contains employee data, including their salaries and the departments they work in. We'll write an SQL query to find the highest salary for each department, which is useful for analyzing salary trends, setting pay standards, and making informed business decisions. Finding the Highest Salary of Each Department To find the highest salary in each department, use SQL's GROUP BY and MAX() functions. The GROUP BY ... Read More
To query data in SQL where you need to match multiple values within the same column, you can use operators like IN and OR. For example, how would you find employees in the "Sales" or "Marketing" departments, or list those with job titles like "Manager" or "Salesperson"? These are common scenarios when filtering data based on multiple conditions in SQL: The IN operator allows you to match values from a list, while OR helps combine multiple conditions efficiently. In this article, we'll show you how to write SQL queries to match multiple values within the same column, making it easier ... Read More
Sometimes, you need to get data from SQL Server that falls between two specific dates or times, like finding all orders placed within a week or all activities that happened during a certain time frame. Writing the right query can be challenging if you're not familiar with how to filter data by date and time. In this article, we will show you how to easily select data between two dates and times in SQL Server using simple queries. Steps to Write Queries for Selecting Data Between Dates and Times As we're going to write queries to filter data ... Read More
In SQL, there are several ways to achieve this, including using LEFT JOIN, NOT EXISTS, and NOT IN. This article will explore these methods in detail, providing examples and guidance on when to use each approach. Using LEFT JOIN with IS NULL Using NOT EXISTS Using NOT IN 1. Using LEFT JOIN with IS NULL The LEFT JOIN operation returns all records from the left table (the first table) and the matching records from the right table (the second table). When no match is found, ... Read More
To insert a node in a linked list using JavaScript, how can we do it? A linked list consists of nodes, each storing data and a reference to the next node. We can insert a new node at various positions: the beginning, a specific position, or the end of the list.. In this article, we'll guide you through how to insert a new node into a linked list in JavaScript, including adding a node at the start, a specific position, or the end. Example Input 1: list = 1 -> 2 -> 3 -> 4 -> 5 -> null; ... Read More
To check if a given year is leap year, We have used two approaches in this article. A leap year has 366 days. In every 4th year, an additional day is added to the month of February to synchronize it with astronomical year. In this article, we are given with two years to check. Our task is to write a JavaScript program to check if a given year is leap year. Approaches to Check Leap Year Here is a list of approaches to check if a given year is leap year in Javascript which we will be discussing ... Read More
In this article, we will learn to prepend a string into all the values of an array in JavaScript. Arrays are versatile data structures used to store multiple elements of similar or mixed types. A common operation is prepending a string to each element of an array, which involves adding a specified string at the beginning of each element. Problem Statement The problem statement can be deeply visualized as given a string text specifically to prepend or attach at the beginning of each element of the array , the output should return the new resultant array with prepended string value ... Read More
In this article, we will learn to initialize a list in Java. A list is an ordered collection that allows us to store and access elements sequentially. It contains index-based methods to insert, update, delete, and search the elements. It can also have duplicate elements. Problem Statement Given a scenario where you need to create and initialize a list in Java, the goal is to understand and implement various approaches to initialize lists effectively. Input Initialize an empty list and add elements − "Apple", "Banana", "Cherry" Output ["Apple", "Banana", "Cherry"] Different Approaches Following are the different approaches to Initialize ... Read More