Interview PrepPostgreSQL

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PostgreSQLPostgreSQL 16+

Query Execution & Indexing Fundamentals

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1. SQL Fundamentals0/7

Query Basics Aggregation JOINs Subqueries CTEs Window Functions Interview Questions

2. How PostgreSQL Executes Queries0/6

Query Lifecycle Scan Methods Sorting JOIN Algorithms Query Planner Interview Questions

3. Indexing0/7

Index Basics B-Tree Composite Indexes Advanced Indexes Index Selection Index Trade-offs Interview Questions

4. EXPLAIN ANALYZE0/4

Reading the Plan Timing Plan Details Interview Questions

5. Query Optimization0/5

Filtering & Sorting Joins & Aggregation Query Patterns Scale Patterns Interview Questions

6. Database Schema Design0/5

Normalization Keys & Constraints Relationships Design Choices Interview Questions

7. Transactions & Concurrency0/4

Transaction Basics Isolation & Anomalies Locking Interview Questions

8. PostgreSQL Performance0/5

Connections Monitoring Maintenance Memory Interview Questions

9. Pagination0/3

Pagination Strategies Implementation Interview Questions

10. Production Optimization0/3

Diagnosis Trade-offs Interview Questions

PostgreSQLIndexingTopic 05

Indexing

Index Selection

Selectivity
Cardinality
When indexes aren't used
Sequential scan vs index scan

Next TopicIndex Trade-offs