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5+ curated questions with the same answer shape every time: quick recap, deep dive, pitfalls, and follow-ups. Coverage includes sql select basics, sql joins ruby, active record vs raw sql, migrations and schema, and more.
Suggested path
Topics follow a teaching order. Each answer ends with a clear Next question control so you can move forward without hunting the list.
SQL and database basics are tested in every Rails fresher interview. Even if you only ever write ActiveRecord, interviewers expect you to understand what SQL it generates, why it generates that SQL, and how to spot and fix an N+1 query. This module covers the SQL that every fresher must know (SELECT, WHERE, ORDER BY, the four JOIN types), how ActiveRecord maps to SQL, designing a simple schema with foreign keys, writing and running a migration, and the N+1 pattern with its .includes fix — the single most commonly asked Rails interview question at the fresher level.
Full catalog
Topics are ordered for learning. Within each topic, rows are numbered 1–5 globally so you always know where you are. Collapse topics if you want a lighter view — use Expand all when you need the full list again.
Numbers 1–5 follow the order we recommend — click any row to open the full answer, or use the sticky Next link at the bottom of each page to go Q1 → Q5.