Author: Trần Huy

Trần Huy

Posts by Trần Huy:

PostgreSQL : subquery, CTE

What is subquery in PostgreSQL? In PostgreSQL, a subquery is a query that is nested inside another query. The subquery is executed first, and its results are used as input to the outer query. Subqueries can be used in various contexts, such as in the SELECT, WHERE, and HAVING clauses of a query. For example, […]

Optimize SQL : rule and todo list

Some rule and todo list to Optimize SQL REF https://www.pgmustard.com/blog/indexing-best-practices-postgresql

PostgreSQL Compound indexes

What is Compound indexes in PostgreSQL? A compound index (also known as a composite index or a multi-column index) refers to an index that is created on two or more columns of a table. It allows PostgreSQL to quickly find rows that match a query condition based on the values in multiple columns, which can […]

Use AWS to deploy your applications and services

Amazon Web Services (AWS) is a cloud computing platform that provides a wide range of services to help businesses and individuals build and deploy applications in the cloud. AWS offers a variety of services such as compute, storage, databases, networking, security, and more. In this guide, we will walk through the steps to get started […]

Use docker to run go project

Docker is a powerful tool that enables developers to create, deploy and run applications in a containerized environment. Using Docker to run Go projects has many advantages, including the ability to isolate your application from the underlying operating system, simplifying the deployment process, and allowing for greater scalability and flexibility. In this guide, we will […]

Install WSL for windows 10

1/ Enable feature Windows Subsystem for Linux Head to Control Panel > Programs > Turn Windows Features On Or Off. Enable the “Windows Subsystem for Linux” option in the list, and then click the “OK” button. Restart computer Now you can type on console: wsl –help 2/ Download ubuntu 18 from Microsoft Store or open […]

How to create your own install-on-air service for installing ios application

To upload your IPA file to your own server, you can follow these steps: Create a web server: You’ll need a web server to host your IPA file. You can either set up a physical server or use a cloud-based server provider such as Amazon Web Services (AWS) or Google Cloud Platform (GCP). Upload the […]

Make a binary file or script file run on startup on ubuntu

To make a binary file run on boot, you can create a startup script that will run the binary file when the operating system starts. The exact process for creating a startup script depends on the operating system you’re using. Here’s an example for a Linux operating system using the systemd init system: Create a […]

RxSwift for ios and swift developer

RxSwift is a powerful tool for iOS and Swift developers that allows you to write cleaner and more maintainable code by leveraging the power of reactive programming. In this article, we will take a look at what reactive programming is, and how you can get started with using RxSwift in your own projects. What is […]

PostgreSQL indexing best practices

Don’t index every column If indexes are so useful, why don’t we add them to every column? There are a few good reasons, but a big one is that indexes add overhead to writes. Not only do indexes need to be kept up to date when we write to the table, but they can also […]