mysql - adding two subqueries to produce third column -

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i need add 2 values 2 subqueries , add third column. can write whole subqueries twice produce sum, there better way it?

select      d.id,     concat(d.disease, '( ', d.disease_nepali, ' ) ') disease,     ifnull((select                      patients.d_o_m + patients.d_o_f                                     patients                                     clinic = 22                         , patients.disease = p.disease),             0) 'district1',     ifnull((select                      patients.d_o_m + patients.d_o_f                                     patients                                     clinic = 21 , disease = p.disease),             0) 'district2'     diseases d         left join     patients p on (d.id = p.disease , p.district = 9         , p.status = 1         , p.report_date '2014-03%') group disease

you can use sub select

select t.*,t.district1 + t.district2  `new_col` ( select d.id, concat(d.disease, '( ' ,d.disease_nepali, ' ) ') disease,  ifnull((select patients.d_o_m+patients.d_o_f patients clinic = 22 ,     patients.disease = p.disease),0) `district1` ,  ifnull((select patients.d_o_m+patients.d_o_f patients clinic = 21 , disease = p.disease),0) `district2`  diseases d left join patients p on  (d.id = p.disease , p.district = 9 , p.status = 1 , p.report_date '2014-03%')  group disease ) t

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