如何在mysql中查询不同的记录

Question

Hi I want to query unique records using distinct in mysql but the problem is that it only returns a single column, how can I make it return all?

Here's my initial query:

SELECT  distinct(country_name)
FROM HST_LOCATION
WHERE person_id='1897'
ORDER BY date_updated DESC
group by country_name

Answer 1

The GROUP BY clause makes that column distinct, there's no need to use the DISTINCT modifier. Just select all the columns and you should get what you want.

SELECT *
FROM HST_LOCATION
WHERE person_id = '1897'
GROUP BY country_name
ORDER BY date_updated DESC