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.
Latihan ini adalah bagian dari kursus
Improving Query Performance in PostgreSQL
Petunjuk latihan
- Write a query to choose all the columns and rows from the
daily_aqitable. - Add the
EXPLAINcommand to show the query plan.
Latihan interaktif praktis
Cobalah latihan ini dengan menyelesaikan kode contoh berikut.
___
SELECT *
FROM ___;