Working with Laravel’s Eloquent Query Builder for Pagination When building database-driven applications, it’s essential to handle pagination effectively. In this article, we’ll explore how to achieve pagination using Laravel’s query builder, specifically when working with DB::raw queries. Introduction to Laravel’s Query Builder Laravel provides a powerful query builder that simplifies the process of constructing complex database queries. The query builder offers several benefits over raw SQL queries, including improved readability and easier debugging.

Fetching Last 24 Hour Records Using Unix Timestamps When working with time-based data, such as Unix timestamps, it’s essential to understand how to effectively query and filter records based on a specific time window. In this article, we’ll explore how to fetch the last 24 hour record using Unix timestamps. Understanding Unix Timestamps Before diving into the code, let’s briefly discuss what Unix timestamps are and how they work. A Unix timestamp is a numerical representation of time in seconds since January 1, 1970, at 00:00:00 UTC.

Introduction to Web Scraping with R ========================== In this article, we will explore how to extract data from a website using R. We’ll start by discussing what web scraping is and why it’s useful, then move on to the tools and techniques needed to get started. What is Web Scraping? Web scraping, also known as web data extraction, is the process of automatically extracting data from websites. This can be done for a variety of reasons, such as:

Introduction to Plotting Simple Moving Averages with Stock Data In this article, we will explore how to plot simple moving averages (SMA) using stock data. We’ll dive into the world of technical analysis and discuss the importance of SMAs in financial markets. What are Simple Moving Averages? A simple moving average (SMA) is a type of moving average that calculates the average value of a series of data points over a fixed period of time.

Understanding the Error: Double Free or Corruption in R with SF Installation Introduction The error “double free or corruption” is a common issue encountered when installing certain packages, including SF (Simple Features) in R. This problem arises from a mismatch between the versions of GDAL and PROJ installed on the system, which are used by SF as dependencies. In this article, we will delve into the causes of this error, explore possible solutions, and provide step-by-step instructions for resolving the issue.

MySQL - Sum revenue while correcting by daily exchange rates In this article, we’ll explore how to sum the revenue from two tables: Orders and Exchange Rates. The Orders table contains information about customer orders with their corresponding total prices in Euros (EUR). The Exchange Rates table stores the daily exchange rates between EUR and other currencies like USD and SEK. We’ll also discuss how to correct these revenues by applying the appropriate daily exchange rates, ensuring that there are no double entries for each day.

Handling Duplicate Values in a Column and Assigning a Value to Other Columns In this article, we’ll explore how to change column values based on duplication in another column using the dplyr library in R. We’ll go through a step-by-step guide on how to use group_by and n() functions to identify duplicates and then assign a value to other columns. Introduction When working with data, it’s common to encounter duplicate values in a particular column.

Understanding the Problem: Refreshing the Plot after Adjusting Radio Buttons and Sliders in Shiny Apps In this article, we will explore how to refresh a plot in a Shiny app after adjusting radio buttons and sliders. We’ll delve into the world of reactive expressions, eventReactive functions, and the Shiny framework. Introduction to Reactive Expressions in Shiny Apps A key concept in building dynamic user interfaces with Shiny is the use of reactive expressions.

Snowflake - Querying JSON In this article, we will explore how to query a JSON file stored as an external table in Snowflake. We will dive into the specifics of how to flatten the JSON data and select specific fields for analysis. Introduction to JSON Data in Snowflake JSON (JavaScript Object Notation) is a lightweight data interchange format that is widely used today. It consists of key-value pairs, arrays, and objects.

Understanding and Implementing Utility Flip as a Menu for Multiple Controllers In this article, we will delve into the world of iOS programming and explore how to use the utility flip as a menu for multiple controllers. This approach allows us to mimic the behavior of the built-in Utility Application template in Xcode, which provides a sleek and modern interface for our app. What is Utility Flip? The utility flip is a design pattern used in iOS applications to provide a secondary view or screen that can be presented as a modal view.