par = "ttt,fgg"
Select * From table Group by &par 

Create Cursor tt ( myValue y)
Insert into tt VALUES ( 99999999 . 9999 )
Insert into tt VALUES ( 111111 . 9999 )

par = "myValue"

Select * from tt order by &par

Create Cursor tt ( myValue y, pp y, kk i)
Insert into tt VALUES ( 99999999 . 9999 ,  44 ,  66 )
Insert into tt VALUES ( 111111 . 9999 ,  99 ,  11 )

par = "myValue,pp"
Select * from tt order by &par

par = "pp"
Select * from tt order by &par

par = "kk"
Select * from tt order by &par

a = 'select * from table order by  '+par
&a

select min(price) from medicine

local aValue[ 1 ]
select min(price) from medicine into array aValue
if _tally> 0 
  ? aValue[ 1 , 1 ]
endif