Question

I have a table in my database which has 4 columns

ID
CATEGORY
NAME
DATA

How could I retrieve the last inserted value of DATA which is filtered by CATEGORY

Answer 1

It isn’t clear whether you want the last value for a given category, or by category, so here’s both solutions:

For a given category:

select data from mytable
where category = ?
order by id desc
limit 1;

For all categories:

select category, data
from (select * from mytable 
    order by id desc) x
group by category;

Note that the second query is a mysql-only solution, but since this is a mysql question, this will work.