MERGE语句是将有条件更新、插入或者删除操作组合起来语法如下： MERGE INTO <target> USING <source>
ON <match-condition>
WHEN [NOT] MATCHED [AND <othe-condition>]
THEN [UPDATE SET ... | DELETE | INS
export to C:\AIOT_20101222.del of del messages C:\AIOT_20101222.log select * from AIOT
import from C:\AIOT_20101222.del of del messages C:\AIOT_20101222.log insert into aiot
load client from C:\AI
