Joining Tables with Similar Values Using a Common Table Expression (CTE) In this article, we will explore how to join two tables based on similar values in their respective columns. We will also discuss how to prevent multiple results for a single entry in the main table. Introduction When working with databases, it’s not uncommon to encounter situations where you need to join two tables together based on similar values in their columns.

Removing Prefix from Returned Columns in TypeORM QueryBuilder =========================================================== When working with the TypeORM query builder, it’s common to encounter situations where you need to transform or remove prefixes from columns in the returned data. In this article, we’ll explore how to achieve this using the TypeORM query builder. Understanding the Problem The provided Stack Overflow question highlights a situation where a developer wants to remove prefixes from column names in a TypeORM query builder.

The Mysterious Case of the Retained UIViewController When dealing with user interface elements and navigation controllers in iOS development, it’s not uncommon to encounter unexpected behavior. In this case, we’re exploring a peculiar issue where a UIViewController fails to get deallocated after being popped from a navigation controller. We’ll delve into the world of memory management, retain counts, and the specific context of UIAlertViews to uncover the root cause of this problem.

Converting Month, Week, and Day Fields into Date Format in MySQL ===================================================== In this article, we will explore how to convert month, week, and day fields into a date format using MySQL. The current table structure has separate fields for month, week, and day, but we want to combine these to form a single date field. Understanding the Challenges The problem with the current table structure is that MySQL treats date fields as integers when they are stored.

Rolling Time Window with Distinct Count in Big SQL ===================================================== In this article, we will explore how to achieve a rolling time window with distinct count in Big SQL for Infosphere BigInsights v3.0. The problem statement involves counting the number of distinct catalog numbers that have appeared within the last X minutes. Background and Problem Statement The question provides a sample dataset with columns row, starttime, orderNumber, and catalogNumb. The goal is to calculate the distinct count of catalogNumb for each row, but only considering the rows from the last 5 minutes.

Understanding SQL Server’s STRING_SPLIT Function Introduction to SQL Server’s STRING_SPLIT Function In recent versions of Microsoft SQL Server, a new function was introduced called STRING_SPLIT. This function allows developers to easily split strings into individual rows. In this article, we will explore how to use the STRING_SPLIT function in SQL Server to achieve this. A Brief History of Splitting Strings in SQL Server Prior to SQL Server 2016, splitting strings was not a straightforward task.

Adding Custom Transparent MKAnnotation to MKMapView In this article, we’ll explore how to create custom transparent annotations for a MKMapView. We’ll delve into the world of Core Graphics and CALayers to achieve this. Introduction to Annotations in MKMapView Annotations in MKMapView are used to display markers on the map. They can be customized to show different types of information, such as location names or image overlays. However, creating custom annotations with transparency is a bit more involved than simply using a standard annotation view.

Calculating Years of Experience in PL/SQL: A Deep Dive ============================================== In this article, we will explore the process of calculating years of experience for employees using PL/SQL, a popular programming language used in Oracle databases. We will break down the code into smaller sections and provide detailed explanations to ensure that our readers can understand the concept. Understanding the Problem Statement The problem statement requires us to write a PL/SQL code that calculates the years of experience for employees with employee numbers 7788 and 7782, and then prints the information for the employee who has the oldest experience.

Understanding Consecutive Trips with Impala Introduction to Impala and SQL Impala is a popular open-source data warehouse system that provides high-performance query capabilities for large-scale data analytics. In this article, we’ll explore how to use Impala to calculate the count of consecutive trips in a given dataset. Before diving into the Impala query, let’s cover some essential SQL concepts and techniques that are crucial to understanding the solution. SQL (Structured Query Language) is a standard language for managing relational databases.

Window Functions in Oracle: Understanding the LAG Function and Its Limitations Introduction Oracle, as with many relational databases, provides various window functions that allow you to perform calculations across rows that are related to the current row. The LAG function is one such window function that allows us to access data from a previous row within the same result set. In this article, we will explore how to use the LAG function in Oracle and its limitations, with a focus on using it to update previous day’s count.