PostgreSQL - fetch the row which has the Max value for a column

Question

I\'m dealing with a Postgres table (called \"lives\") that contains records with columns for time_stamp, usr_id, transaction_id, and lives_remaining. I need a query that wil

Answer 1

There is a new option in Postgressql 9.5 called DISTINCT ON

SELECT DISTINCT ON (location) location, time, report
    FROM weather_reports
    ORDER BY location, time DESC;

It eliminates duplicate rows an leaves only the first row as defined my the ORDER BY clause.

see the official documentation