1) What is the primary key on the VISIT_DETAIL?

2) What kind of primary key is it?

APPONTMENT PK APPT NUM APPT DATE APPT TIME PATIENT DOCTOR PK PAT NUM FK1 INS PLAN CD PK DOC ID PAT_LNAME PAT FNAME PAT AREACODE PAT PHONE PAT EMAIL DOC LNAME DOC FNAME DOC OFFICE DOC EXTENSION FK1 PAT NUM FK2 DOC ID attends C VISIT_DETAIL VISIT PK1,FK1VISIT NUM PK VISIT NUM VISIT_DATE VISIT TIME PK2 VISIT_LINE NUM FK2 PAT NUM FK3 DOC ID tten FK1 PAT NUM FK2 DOC ID VISIT_DATE VISIT TIME pays F INSURANCE INS PAY DETAIL PK INS PLAN CD PK1,FK1 VISIT NUM INSURE COMPANY INSURE_CONTACT INSURE AREACODE INSURE PHONE INSURE EMAIL PK2,FK2 VISIT LINE NUM FK3 INS PLAN CD ADJUST AMT