Top 50 database querying Interview Questions

Use SQL window functions to rank regions by average 2024 yield within each country.

Window FunctionsJoinsData ManipulationErnst & YoungKBRMaximus Tech

Extract qualifying market observations by venue and price, then return them in chronological order.

JoinsData ManipulationGroup ByEquifaxDPR ConstructionRigUp

Identify common SQL join types and explain when each is appropriate.

Find the second highest distinct salary and adapt the query to retrieve any requested salary rank.

Data Manipulationsqldatabase queryingTech MahindraSnowflake ComputingKKGISL

Compare RANK, DENSE_RANK, and ROW_NUMBER by applying each to ordered employee scores.

Data ManipulationRankingdatabase queryingBBlinkitPPricelineMeesho

Task A reporting query at a commerce platform summarizes recent orders for active customers, but the production version is slow. Write a PostgreSQL query t...