Question

I have a table that goes as follows:

content_id | contact_count
         1              23
         2               4
         3              89

I want to select the content_id with the highest contact_count from the last 25 rows of the table.

I’ve tried many different things such as:

select content_id from research_products_content
   where contact_count=(select max(contact_count)
        from research_products_content order by rating_total_id desc limit 25)
   order by rating_total_id desc limit 1

Answer 1

In your example, limit 25 is applied after the result (max, which is a single row) is selected. Try this instead:

SELECT tmp.content_id FROM (
  SELECT *
  FROM research_products_content
  ORDER BY rating_total_id DESC
  LIMIT 25
  ) AS tmp
WHERE tmp.contact_count = (
  SELECT max(tmp2.contact_count)
  FROM (
    SELECT *
    FROM research_products_content
    ORDER BY rating_total_id DESC
    LIMIT 25
  ) AS tmp2
)
LIMIT 1