postgresql

PostgreSQL Sequential Scan

Understand how a Sequential Scan works in PostgreSQL and when to optimize it.

SELECT * FROM users WHERE age > 25;

A Sequential Scan reads every row in the table to check if it matches the filter condition. This is efficient for small tables but can be slow for large datasets where an index would allow direct access to the required rows.

Interactive Execution Plan

EXPLAIN Output

Run: EXPLAIN (ANALYZE, COSTS, VERBOSE, BUFFERS, FORMAT TEXT) your_query;

Enter SQL EXPLAIN output to visualizeSupports PostgreSQL EXPLAIN ANALYZE, MySQL EXPLAIN, and SQLite EXPLAIN QUERY PLAN formats