# Crack SQL Interviews with These PostgreSQL Internals & Real Questions

If you’re preparing for a SQL, backend or data engineering role, it’s not enough to just know SQL — you’ll need to understand **how PostgreSQL works behind the scenes**.

In my latest blog, I share:

* The real SQL queries I was asked in interviews, from recursive CTEs to rolling sums
    
* Deep-dive questions on PostgreSQL indexing, query planning, partitioning, and sharding
    
* CDC implementation strategies using WAL, Debezium, and native logical replication
    

💬 I also cover tips on interpreting execution plans and designing scalable systems with Postgres as the core.

👉 [Check out the full article here](https://kiransabne.dev/cracking-the-sql-interview-real-questions-and-postgresql-internals-you-should-know)