CREATE TABLE appointment (prepnurse VARCHAR)
CREATE TABLE nurse (name VARCHAR, employeeid VARCHAR)

What is the name of the nurse has the most appointments?
SELECT T1.name FROM nurse AS T1 JOIN appointment AS T2 ON T1.employeeid = T2.prepnurse GROUP BY T1.employeeid ORDER BY COUNT(*) DESC LIMIT 1
SELECT "T1"."name" FROM "nurse" AS "T1" JOIN "appointment" AS "T2" ON "T1"."employeeid" = "T2"."prepnurse" GROUP BY "T1"."employeeid" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1