Check out the sample statement from the QV reference manual. You'll probably need to use variables or something to get the first 100 or you might be able to use the FIRST statement if it spits the table out randomly but off the top of my head I don't know if it does.
The sample prefix is used to load a random sample of records from the input
The syntax is:
sample p ( loadstatement | selectstatement )
p is an arbitrary expression which evaluates to a number larger than
0 and lower or equal to 1. The number indicates the probability for a
given record to be read.
Sample 0.15 Select * from Longtable;
Sample 0.15 Load * from Longtab.csv;
The load statement syntax is described on page 309. The select statement