How do i get min, median and max from my query in postgresql

Question

I have written a query in which one column is a month. From that I have to get min month, max month, and median month. Below is my query.

select ext.employee         


        

Answer 1

To find Median: for instance consider that we have 6000 rows present in the table.First we need to take half rows from the original Table (because we know that median is always the middle value) so here half of 6000 is 3000(Take 3001 for getting exact two middle value).

SELECT *
      FROM (SELECT column_name
            FROM Table_name
            ORDER BY column_name
            LIMIT 3001)
      ORDER BY column_name DESC ---->Look here we used DESC(Z-A)it will display the last 
                                --   two values(using LIMIT 2) i.e (3000th row and 3001th row) from 6000 
                                --   rows  
      LIMIT 2;