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Advanced

Window functions, optimization, security, triggers, partitioning, and real-world SQL patterns.

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Window Functions

Use statistical window functions for percentiles, distributions, and bucket analysis.

Identify and fix slow queries using indexes, statistics, and query rewriting.

Automatically execute functions in response to INSERT, UPDATE, or DELETE events.

Restrict which rows users can see or modify using Row-Level Security policies.

Control database access with roles, privileges, and the GRANT/REVOKE system.

Split large tables into smaller partitions for better query performance and manageability.

Understand how PostgreSQL achieves concurrent read/write without blocking using MVCC.

Design schemas that eliminate data redundancy and anomalies through normalization.

Back up and restore PostgreSQL databases using pg_dump and pg_restore.