POSTGRESQL DATABASE INTERVIEW QUESTIONS

What does the term "cardinality" mean in the context of PostgreSQL?

How does cardinality affect the performance of queries in PostgreSQL?

Why is it important to understand the cardinality of columns when designing a PostgreSQL database?

What is the difference between high and low cardinality in PostgreSQL, and how might you handle each in terms of indexing?

How does PostgreSQL's query planner use cardinality estimates to optimize query execution?

Can you explain the role of statistics in determining cardinality in PostgreSQL?

What challenges might arise from inaccurate cardinality estimates in PostgreSQL, and how can they be mitigated?

Discuss how multi-column cardinality can affect query performance and indexing strategies in PostgreSQL.

How does PostgreSQL handle cardinality in distributed databases or partitioned tables?

Explain how cardinality and selectivity are related in the context of PostgreSQL and their impact on index design.