Mysql min and max values and corresponding “date” for each month

Question

I have a table named \"rates\" and it has two fields \"date\" and \"rate\". I like to get MIN and MAX rate values and their dates on which they occurred for each month. But

Answer 1

Try this query, the database name is test, you can use yours or remove it:

SELECT 
  MIN(rate) AS minRate,
  (select date from test.rates where rate = min(co.rate) and  
    month(date) = month(co.date) and year(date) = year(co.date) limit  
  )as min_date,
  MAX(rate) AS maxRate,
  (select date from test.rates where rate = max(co.rate) and  
    month(date) = month(co.date) and year(date) = year(co.date) limit 1) as 
  max_date
FROM test.rates co 
GROUP BY year(date) , month(date)