Condition before load

[#1]

i want to do

if (condition)=true then load

is that possible ?

thks

[#2]

I found the answer.

IF a>0 then

load * from A.qvd (qvd);

ELSEIF a<0 THEN

load * from B.qvd (qvd);

ELSE

load * from C.qvd (qvd);

END IF