Select first row for each group in PostgreSQL
Given a table seasons:
| id | team | points |
|---|---|---|
| 1 | Liverpool | 82 |
| 2 | Liverpool | 84 |
| 3 | Brighton | 34 |
| 4 | Brighton | 28 |
| 5 | Liverpool | 79 |
We want to find the rows containing the maximum number of points per team.
The expected output we want is:
| id | team | points |
|---|---|---|
| 3 | Brighton | 34 |
| 2 | Liverpool | 84 |
From the SQL Editor, you can run a query like:
12345678910select distinct on (team) id, team, pointsfrom seasonsorder BY id, points desc, team;The important bits here are:
- The
desckeyword to order thepointsfrom highest to lowest. - The
distinctkeyword that tells Postgres to only return a single row per team.
This query can also be executed via psql or any other query editor if you prefer to connect directly to the database.