DataWorks中maxcompute建议每天对人员表、订单表进行全量同步？

根据数据仓库反映历史变化的特点，建议每天对人员表、订单表等会发生变化的数据进行全量同步，即每天保存的都是全量数据，方便您获取历史数据和当前数据。真实场景中因为某些特殊情况，需要每天只进行增量同步。但MaxCompute不支持Update语句修改数据，只能通过其它方式实现。下文将为您介绍两种同步策略（全量同步、增量同步）的具体操作。执行下述语句准备数据。drop table if exists user ;create table if not exists user(uid int,uname varchar(50),deptno int,gender VARCHAR(1),optime DATETIME);--历史数据insert into user values (1,'LiLei',100,'M',str_to_date('2016-11-13','%Y-%m-%d'));insert into user values (2,'HanMM',null,'F',str_to_date('2016-11-13','%Y-%m-%d'));insert into user values (3,'Jim',102,'M',str_to_date('2016-11-12','%Y-%m-%d'));insert into user values (4,'Kate',103,'F',str_to_date('2016-11-12','%Y-%m-%d'));insert into user values (5,'Lily',104,'F',str_to_date('2016-11-11','%Y-%m-%d'));--增量数据update user set deptno=101,optime=CURRENT_TIME where uid = 2; --null改成非nullupdate user set deptno=104,optime=CURRENT_TIME where uid = 3; --非null改成非nullupdate user set deptno=null,optime=CURRENT_TIME where uid = 4; --非null改成nulldelete from user where uid = 5;insert into user(uid
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