How do SQL and NoSQL differ?
Review note: The answer refers to the original author's CV or target job offer — adapt it to your own experience.
Answer out loud or in your head first, then compare.
Answer
SQL is a language used in relational databases such as PostgreSQL, among others. There we usually describe data as tables, and relationships between them can be expressed with keys and queries that join tables. NoSQL is a broad name for other database models, e.g. document, key–value and graph. It's not one specific product.
For users, projects and billing, relationships and transactions often favour a relational database. A document database can conveniently store a complex document as a whole. It isn't true that NoSQL never has schemas or transactions, or that SQL always scales worse. The choice depends on how data is read and written and on the correctness requirements.
Why it matters: Puts PostgreSQL, MongoDB, Redis and KV from your CV in order.
Possible follow-ups: What matters more: the database category's name, or the actual guarantees of a particular product?
How did it go? Be honest — “Not yet” puts the question on your review list.
Related questions
- Documents vs SQL — MongoDB
Further reading
- PostgreSQL: Transaction Isolation(opens in a new tab)Docs; accessed 22.10.2026. Isolation, locks and serialization anomalies; a good basis for working with an ORM.