sql - Combining Rows and Taking Averages -

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i have table looks 

#sector  max1   avg1   max2  avg2  numb c         133    14     45    3     27 n         174     9     77    3     18 m         63      3     28    1     16

i join rows n , m call x , take max value of max1 , max2 while taking avg of avg1, avg2, , numb in respective columns return

#sector  max1   avg1   max2  avg2  numb c         133    14     45    3     27 x         174     6     77    2     17

try way:

select sector, max1,avg1,max2,avg2,numb tab sector not in ('m','n') union select 'x' sector, max(max1),avg(avg1),max(max2),avg(avg2),avg(numb) tab sector in ('m','n')

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