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            2. ´´½¨ db_link£¬Ö´ÐÐÒÔÏÂÃüÁ
                      create database link db_linkÃû connect to Óû§Ãû identified by ÃÜÂë using '¼àÌý·þÎñÃû';
            3. ʹÓÃÁ´½ÓµÄÊý¾Ý¿â£¨±íÃûΪ“ʵ¼Ê±íÃû@db_linkÃû”£©¡£
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                      create synonym aaa for ±íÃû@db_linkÃû;
     
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                     grant create materialized view to desc;
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                     create materialized view log on test1 with primary key;
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SQL> create table t1_number (num number);
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SQL> insert into t1_number values(0.3268);
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SQL> insert into t1_number values(0.57965686);
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