select - MySql add new column as result -


i have query:

select v2.longitude points v2

now want this:

select v2.longitude something,2*something points v2

but fails with

points.longitude float number

how can fix this?

edit- here example of current query:

$query=" select v2.longitude xa, v2.latitude ya, v3.longitude xb, v3.latitude yb, (yb-ya)/(xb-xa) l, -1/l l_katheto, (l*xa-l_katheto*$tetmimenh+ya-y1)/(l_katheto-l) x_tomh, l*(x_tomh-xa)+ya y_katheto, min( sqrt( (v2.longitude-$tetmimenh)* (v2.longitude-$tetmimenh)+ (v2.latit‌​ude-$tetagmenh)* (v2.latitude-$tetagmenh) ), sqrt( (v3.longitude-$tetmimenh)* (v3.long‌​itude-$tetmimenh)+ (v3.latitude-$tetagmenh)* (v3.latitude-$tetagmenh) ), sqrt( ($tetmi‌​menh-x_tomh)* ($tetmimenh-x_tomh)+ ($tetagmenh-y_tomh)* ($tetagmenh-y_tomh) ) ) segments v1 join points v2 on v1.from_point=v2.point_id join points v3 on v3.point_id=v1.to_point";

try code:

select v2.longitude something,2*v2.longitude something2 points v2

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