In reply to Peter Flom.

It's easier: Just define a DATA step view and define x=0.

data Want / view=Want;
set sashelp.cars;
x = 0; /* dummy variable, used for strip plot */
run;

/* Create a strip plot.
Use a format to bin dates into months:
https://blogs.sas.com/content/iml/2016/08/08/sas-formats-bin-numerical-variables.html
*/
ods graphics / width=200px height=400px;
proc sgplot data=Want;
scatter x=x y=MPG_City /
jitter transparency=0.5 /* handle overplotting */
markerattrs=(symbol=CircleFilled);
xaxis type=discrete display=(nolabel novalues noticks); /* create categorical axis */
yaxis grid;
run;