-
Rounding Averages in PostgreSQL, SQL, and Ruby
PostgreSQL:Using the round() function:SELECT round(avg(column_name), 2) AS rounded_average FROM your_table; round(avg(column_name), 2) rounds the average of the column_name to 2 decimal places
-
Understanding SQLite3::BusyException in Ruby on Rails
Several common scenarios can lead to this exception:Multiple Rails Processes: If your application is running multiple instances (e.g., in a production environment), they might try to access and modify the database concurrently
-
Troubleshooting Ruby on Rails Database Connection Error: PG::ConnectionBad
PG::ConnectionBad: This indicates an issue with establishing a connection to the PostgreSQL database server from your Ruby on Rails application
-
Understanding Rails Database Management: migrate, reset, and schema:load
A popular web development framework built on top of Ruby that streamlines the process of creating database-backed web applications
-
`destroy_all` vs. `delete_all` in Ruby on Rails: Understanding Database Deletion
destroy_all:Behavior:Iterates over each record matching the conditions (if provided).For each record, it calls the model's destroy method
-
Ruby Gems and Development Libraries: A Guide to Successful Installations
gem install: This command is used in Ruby to install gems (packages) that provide additional functionalities.Failed to build gem native extension: The error indicates that the gem you're trying to install (likely a gem that interacts with MySQL) requires compiling native code extensions for performance reasons
-
Resolving Ruby Library Installation Issues: The Case of sqlite3-ruby on Ubuntu
Ruby: A popular programming language known for its simplicity and readability. It's often used for web development, data analysis
-
Connecting Ruby to PostgreSQL: Installing the pg Gem on Ubuntu
Understanding the Components:Ruby: A versatile programming language often used for web development. It provides a way to write code that interacts with databases and other systems
-
Managing Database Schema Changes: Dropping Columns with Rails Migrations
Concepts involved:Ruby on Rails (Rails): A web development framework that simplifies building database-backed web applications
-
Eager Loading vs. Join Queries in Ruby on Rails: Understanding `includes` and `joins`
Fetches data from all related tables in a single query.This is efficient when you need to access data from the associated tables for most or all of the results