Question

Table Structure

id | term | result
==================
1  | t1   | 0
2  | t2   | 0
3  | t1   | 34
4  | t1   | 23
5  | t2   | 10
6  | t2   | 10
7  | t3   | 20

The table is for a search table where term is the keyword someone was searching for, and result is the number of results returned at that time. Now from this table I need to retrieve
1) number of times a term was searched for and
2) the number of results that were returned when it was last search for.

for the first one I can do count(term) group by term, and for 2 probably ORDER by id DESC, but I don’t know how to do both in a single query. Any help?

Answer 1

You want the groupwise maximum:

SELECT term, count, result
FROM   my_table NATURAL JOIN (
         SELECT term, COUNT(*) count, MAX(id) id FROM my_table GROUP BY term
       ) t

See it on sqlfiddle.