如何获取表格中每个类别的最新日期？

Question

I am trying to get the most recent date for every category. This is my table:

tables names:

threads table:
threadID
title
category
author
date_posted
post
last_author
last_reply
total_posts
isLocked
isSticky

$result = mysqli_query($conn, "SELECT * FROM threads
                               GROUP BY category
                               ORDER BY last_reply");

This gives me the date of the first row appearing in the table with that category. I want to be able to get the most recent date for that category not the first seen row. Thanks.

Answer 1

The solution was to use the aggregation function MAX() like this:

SELECT Max(last_reply) as recent FROM threads
GROUP BY category
ORDER BY last_reply

_{Answer added on behalf of OP}

Answer 2

To choose the most recent date per category in the table and if the date is contained in the column last_reply then you can try the following query for the same:

SELECT category, Max(last_reply) as most_recent_date FROM threads GROUP BY category;