Relational Databases & SQL

18 interview prep topics with adaptive MCQ tests.

ACID Properties
ACID properties represent the foundational standard for database transaction integrity in relational systems. In 2026,…
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B-Tree Indexing
B-Tree indexing is the foundational data structure for high-performance relational databases. In 2026, as systems…
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Database Connection Pooling
Database connection pooling is a critical architectural pattern used to manage the lifecycle of database connections,…
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Database Migrations (Alembic, Flyway)
Database migrations are the programmatic process of managing schema evolution in relational databases. In 2026, as…
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Database Normalization
Database normalization is the systematic process of organizing data in a relational database to minimize redundancy and…
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Database Sharding Strategies
Database sharding strategies represent the architectural backbone of horizontal scaling for high-throughput relational…
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MVCC (Multi-Version Concurrency Control)
Multi-Version Concurrency Control (MVCC) is the industry-standard mechanism for managing concurrent database access…
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N+1 Query Problem
The N+1 query problem is a classic performance anti-pattern in database-driven applications, occurring when an…
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PostgreSQL Full-Text Search
PostgreSQL Full-Text Search (FTS) is a robust, built-in capability that allows developers to perform sophisticated…
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PostgreSQL Table Partitioning
PostgreSQL table partitioning is a critical architectural pattern for managing multi-terabyte datasets by breaking…
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Read Replicas vs Write Scaling
In modern distributed system design, scaling databases is a fundamental challenge. Read replicas and write scaling…
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SQL CTEs (Common Table Expressions)
Common Table Expressions (CTEs) are temporary, named result sets defined within the execution scope of a single SELECT,…
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SQL Execution Plans (EXPLAIN)
SQL Execution Plans, typically accessed via the EXPLAIN command, are the blueprint of how a relational database…
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SQL Window Functions
SQL Window Functions are a critical component of modern data engineering and analytics, allowing for complex…
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Transaction Isolation Levels
Transaction isolation levels define the degree to which the operations in one transaction are hidden from other…
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Clustered vs Non-Clustered Indexes
The architectural distinction between clustered and non-clustered indexes sits at the core of relational database…
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Database Deadlock Mitigation
Database deadlock mitigation refers to the architectural strategies, prevention protocols, and recovery patterns…
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SQL Joins
SQL joins represent one of the most fundamental operational paradigms in relational database management systems,…
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