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  3. Improving Query Performance in PostgreSQL

Exercise

Basic EXPLAIN

Checking the query plan is an excellent window into the query function. Seeing the query plan steps helps you understand if you can restructure your query or add additional conditions to limit the rows and improve query speed. Comparing the relative costs between different query structures helps you see which plan is more efficient.

Here, you will be examining USA daily air quality data. First, familiarize yourself with running a query that will show the query plan.

Instructions

100 XP
  • Write a query to choose all the columns and rows from the daily_aqi table.
  • Add the EXPLAIN command to show the query plan.