多种数据库之间 update的不同

sql server

update a

set a.gqdltks=b.gqdltks,a.bztks=b.bztks

from landleveldata a,gdqlpj b

where a.GEO_Code=b.lxqdm

oracle 和 DB2

update landleveldata a set (a.gqdltks, a.bztks)= (select b.gqdltks,b.bztks from gdqlpj b where a.GEO_Code=b.lxqdm)