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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.

This exercise is part of the course

Improving Query Performance in PostgreSQL

View Course

Exercise instructions

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

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

___
SELECT * 
FROM ___;
Edit and Run Code