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