Top 50 database concepts Interview Questions
The most frequently asked database concepts questions across all roles and companies, ranked by real interview frequency. Updated daily.
Explain how TRUNCATE and DELETE differ in row removal, transaction behavior, and identity handling.
ArcesiumUse PostgreSQL metadata to list the structure and column details of a database table.
Peraton
CATERPILLARExplain DDL, DML, and DCL, then classify PostgreSQL commands by their SQL command category.
Newgen SoftwareCompare RANK, DENSE_RANK, and ROW_NUMBER by applying each to ordered employee scores.
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Identify the primary key in an inventory table and return its unique, non-null values.
Minnesota Department Of Health
Pcs Research Group
PCS Global TechExplain 1NF through higher normal forms, including functional dependencies, anomalies, and normalization trade-offs.
Aqr Capital Management
IBMExplain LEFT JOIN behavior and compare data lakes with data warehouses using a concise SQL example.
CA Firm in Kolkata
PwC India
PwCCompare DELETE, TRUNCATE, and DROP by their effects on rows, table definitions, filtering, and transaction rollback.
Emerson
Infosys