Question

I am trying to write a query that takes both the max and min values from a table group by id. Basically, I have a table that adds renewals for new annual amounts off an existing contract_id as such:

customer_id | contract_id | start_date | end_date   | revenue
6           | 125         | 2012-01-01 | 2012-12-31 | 10,000
6           | 126         | 2012-01-01 | 2013-12-31 | 5,000
6           | 125         | 2013-01-01 | 2013-12-31 | 12,000
6           | 126         | 2014-01-01 | 2015-12-31 | 8,000

What I want to take the minimum start_date, the maximum end_date, and the corresponding revenue for that end_date, grouped by contract_id for a given customer_id.

So, the query would ideally return:

customer_id | contract_id | start_date | end_date   | revenue
6           | 125         | 2012-01-01 | 2013-12-31 | 12,000
6           | 126         | 2012-01-01 | 2015-12-31 | 8,000

I can get the max stuff, but I’m having trouble pulling in both MAX and MIN in the same query. Any help would be greatly appreciated. Thanks!

Answer 1

You should try this Query also see the screenshot for verification (see image 1)

SELECT r.`contract_id`,r.`start_date`,
(SELECT sub_r.`end_date` FROM `table` sub_r where sub_r.`contract_id` = r.`contract_id` 
ORDER BY sub_r.`revenue` DESC limit 1 )
AS `end_date`,
(SELECT sub_r.`revenue` FROM `table` sub_r where sub_r.`contract_id` = r.`contract_id` 
ORDER BY sub_r.`revenue` DESC limit 1 )
AS `revenue` 
FROM `table` r GROUP BY r.`contract_id`;

Image 1