Introduction to Returning Ties from Aggregation Functions in SQLite In this article, we will explore how to return ties from aggregation functions in SQLite. We will go through the steps of creating a database schema, writing a SQL query to retrieve the oldest child’s name and date of birth, and then explain different approaches to solve the problem. Understanding the Problem The problem involves retrieving the name and date of birth of the oldest child for a specific person (Michael Fox) in a SQLite database.

Understanding Push Notifications with Urban Airship Introduction In recent years, push notifications have become an essential feature for mobile applications. They allow developers to send targeted messages to users who have installed their app. Urban Airship is a popular platform for sending push notifications, and this article will focus on registering device tokens with Urban Airship. What are Device Tokens? Understanding the Basics Before we dive into the process of registering device tokens, it’s essential to understand what they are.

Understanding UIScrollView and CALayers As a developer, working with custom views and subviews can be both exciting and challenging. When it comes to scrollable content, using UIScrollView is often the best approach. However, when dealing with CALayers, things can get complicated. In this article, we’ll explore the relationship between UIScrollView and CALayers, and how to correctly implement scrolling behavior. Introduction to CALayers Before diving into the world of scrollable content, let’s take a brief look at what CALayers are.

Saving and Restoring Mutable Arrays in iOS with PathDrawingInfo Objects When developing an iOS application, it’s not uncommon to encounter situations where data needs to be saved and restored for later use. In this scenario, we have a mutable array of PathDrawingInfo objects that are constantly being redrawn due to events happening within the app. Our goal is to save this array with a title so that users can select a previous drawing to load, modify, and resave.

Grouping Timestamps into Intervals of Given Length in Java Introduction Timestamps can be a challenging data type to work with, especially when it comes to grouping them into intervals of varying lengths. In this article, we’ll explore how to group timestamps into intervals of given length in Java. Problem Statement Suppose you have a table for metrics in an Oracle database with a timestamp column. You want to read the metrics from the DB, group them into intervals of any length (e.

Understanding the RDS Inflation Issue in saveRDS In this article, we will delve into the world of RDS (R Data Structures) and explore why the saveRDS function can inflate the size of an object to unexpected levels. We’ll examine a real-world scenario where an R package is used to build and process large datasets, and discuss potential solutions to reduce the size of the saved data structure. Background: How saveRDS Works The saveRDS function in R is used to serialize an R object into a binary format that can be stored on disk or sent over a network.

Model Averaging Gamm4 Models: A Step-by-Step Guide to Parameter Estimation and Reporting In this article, we will delve into the world of model averaging for gamm4 models. We’ll explore how to obtain overall estimates associated with each predictor variable, regardless of the knot level, and discuss how to report estimates from gamm4 models in a meaningful way. Introduction Model averaging is a statistical technique used to combine the results of multiple models to produce a single, more accurate estimate of the true model.

Understanding Timestamps in JSON Files JSON (JavaScript Object Notation) is a lightweight data interchange format that has become widely adopted for exchanging data between web servers, web applications, and mobile apps. One of the key features of JSON is its ability to represent various data types, including numbers, strings, booleans, arrays, and objects. However, one limitation of JSON is its lack of built-in support for timestamps. When dealing with time-based data, it’s common to use ISO 8601-formatted strings, which can be used in conjunction with JSON files.

Stacking Columns in Pandas Barh Plot Introduction In this article, we will explore how to create a bar chart with pandas where only selected columns are stacked. We will cover the basics of creating a bar chart and then dive into customizing the plot to achieve our desired outcome. Background A barh (horizontal bar) plot is similar to a traditional bar plot, but it plots data along the horizontal axis instead of the vertical axis.

Understanding Rectangle Intersections in 2D Graphics ===================================================== In computer graphics, scenes are often composed of multiple objects, each with its own geometry. When checking for intersection between two rectangles, we need to consider the coordinate systems and transformations applied to these objects. In this article, we will explore how to check for rectangle intersections in a top-down game scene, focusing on child nodes and their coordinate system. Introduction In the context of game development, when an object’s position changes, its rectangular bounding box also moves relative to the parent or world node.