` Optimizing Database Queries in PHP & CodeIgniter 4 for Financial ERPs Hello Tech Community! 👋 I am Ajay, a full-stack developer with a deep background in professional accounting. When building SaaS applications, especially in the ERP and financial sector, database performance is everything. A slow query in a blog is a minor inconvenience, but a slow query when generating a multi-department payroll or financial ledger can crash your server. Today, I want to share a few advanced database optimization techniques I use when writing backend logic in PHP and CodeIgniter 4. The Problem with Financial Data Financial software requires executing complex JOINs across multiple massive tables: daily attendance logs, employee profiles, tax brackets, and salary components. If your schema is not optimized, these operations become a massive bottleneck. 3 Advanced Tips for Query Optimization 1.…