select
CompanyDbId = c.CMPANYID
,DynamicsDbId = d.CMPANYID
,DynamicsDbName = d.INTERID
,DynamicsCompanyName = d.CMPNYNAM
from sy00100 c
left join dynamics..sy01500 d
on d.interid = db_name()
--update SY00100 set CMPANYID = (select CMPANYID from DYNAMICS..sy01500 where INTERID = db_name())