update table1 set table1.列=table2.列 from table2 where table2.列=table1.列
update NFYSP.dbo.PATIENT     set
PATIENT_ADDUSERID=OLD.PATIENT_ADDUSERID
,PATIENT_UPDATEUSERID=OLD.PATIENT_UPDATEUSERID
,PATIENT_UPDATEUSERNAME=OLD.PATIENT_UPDATEUSERNAME
,PATIENT_ADDUSERNAME=OLD.PATIENT_ADDUSERNAME 
from CRM_XJP.dbo.PATIENT OLD where PATIENT.id=OLD.id

UPDATE    ASET    foo = B.barFROM
    TableA A
JOIN    TableB B
ON A.col1 = B.colx
WHERE ...