The SQL expression below will yield

SELECT SS#$,$ NAME, PHYSICIAN

FROM PATIENT

WHERE PHYSICIAN $=\text{'}$Xu$\text{'}$;

all physicians with the last name $xu.$

all patients with the last name $x.$

all patients with $xu$ as theipphysician.

The social security number of all physicians with the last name $xu.$

The social security number and name of all patients with Xu as their physician.