Build reusable PostgreSQL functions and procedures to calculate order totals, validate orders, apply discounts, and centralize database business logic.
PostgreSQL Stored Procedures and User-Defined Functions Read More »
Use Python type hints and mypy to catch incompatible arguments and return values, understand static checking, and improve code reliability.
Type Hints and Static Type Checking with mypy in Python Read More »
Use AWS CLI to inspect and safely update Route 53 DNS records with hosted zone lookups, JMESPath filters, JSON change batches, UPSERT, and change-status checks.
How to Manage Route 53 DNS Records with AWS CLI Read More »
Learn the essential PowerShell cmdlets for working with files and directories, including reliable path construction with Join-Path and safe cleanup practices.
Creating and Managing Files and Directories in PowerShell Read More »
Use Bash and SSH to collect remote Linux system information securely, with practical examples for key-based authentication, disk checks, quoting, and failure handling.
How to Run Secure Remote Commands with SSH in Bash Read More »
Learn how SQL COALESCE returns the first available value when customer contact fields contain NULL, with practical report examples and exercises.
How to Use COALESCE in SQL to Handle NULL Values Read More »
Build a simple task database in Python with SQLite. Learn how to create tables, insert records, search with LIKE, update tasks, and manage connections safely.
Working with SQLite Databases in Python Read More »
Use the AWS CLI to investigate CloudTrail events, identify who changed an AWS resource, and inspect the API request behind a suspicious change.
How to Use AWS CLI CloudTrail Event Lookup Commands Read More »
Build a beginner-friendly PowerShell script that checks Windows service status and restarts stopped services using Get-Service and Restart-Service.
Managing Windows Services with PowerShell Get-Service and Restart-Service Read More »
Learn to create unique temporary files and directories in Bash with mktemp, then remove them automatically using an exit trap.
Secure Temporary Files in Bash with mktemp Read More »
