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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

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