We present a sample of 148 candidate RR Lyrae stars selected from Sloan Dig
ital Sky Survey (SDSS) commissioning data for about 100 deg(2) of sky surve
yed twice with Delta t = 1.9946 days. Although the faint-magnitude limit of
the SDSS allows us to detect RR Lyrae stars to large Galactocentric distan
ces (similar to 100 kpc, or r* similar to 21), we find no candidates fainte
r than r* similar to 20, i.e., farther than similar to 65 kpc from the Gala
ctic center. On the assumption that all 148 candidates are indeed RR Lyrae
stars (contamination by other species of variable star is probably less tha
n 10%), we find that their volume density has roughly a power-law dependenc
e on Galactocentric radius, R-2.7+/-0.2, between 10 and 50 kpc and drops ab
ruptly at R similar to 50-60 kPc, possibly indicating a sharp edge to the s
tellar halo as traced by RR Lyrae stars. The Galactic distribution of stars
in this sample is very inhomogeneous and shows a clump of over 70 stars at
about 45 kpc from the Galactic center. This clump is also detected in the
distribution of nonvariable objects with RR Lyrae star colors. When sources
in the clump are excluded, the best power-law fit becomes consistent with
the R-3 distribution found from surveys of bright RR Lyrae stars. These res
ults imply that the halo contains clumpy overdensities inhomogeneously dist
ributed within a smooth R-3 background, with a possible cutoff at similar t
o 50 kpc.