PCA (Prometheus Certified Associate) sample exam question with answer 552

Question:
What is the name of the language used to query Prometheus?

1. PQL
2. SQL
3. JSON
4. PromQL

Answer:
D - is the correct answer. More at querying basics
A - is incorrect as Prometheus uses a custom query language called Prometheus Query Language. The abbreviation of this query language is PromQL, not PQL
B, C - are incorrect as Prometheus uses a time series database, not a relational database. Additionally, Prometheus uses its own custom query language called PromQL for querying its time series database