Top 50 Subqueries Interview Questions
The most frequently asked Subqueries questions across all roles and companies, ranked by real interview frequency. Updated daily.
Find the second highest distinct salary from a single table using basic PostgreSQL ordering and limiting.
eClinicalWorksNNeenOpal Canada
InformaticaFind the second highest salary in each department without using aggregate functions.
Credit Genie
Devoteam
Cisco Restaurant + BarRewrite a slow PostgreSQL reporting query to reduce scanned rows, avoid join multiplication, and return accurate monthly site metrics.
Continental Finance
Capgemini
DISHFind the second-highest distinct transaction amount using a subquery in PostgreSQL without LIMIT.
Capgemini FSSBU
Freecharge
NPCIDemonstrate a PostgreSQL approach for optimizing a filtered aggregation query over related tables.
Boeing Intelligence & AnalyticsRRM Design & Engineering
WaymoCompute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.
Gain Digital
TCS
Zest AIFind the second highest distinct employee salary from a single table, returning NULL if it does not exist.
Best Buy
Amtex Systems
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Use a CTE, join, and dense ranking to return each client's second-highest distinct transaction amount.
The Ameriprise
Tata Consultancy Services (North America)
Wells Fargo