1：导入数据
imp80 system/manager@orcl file=D:\TEMP\dbfile1.dmp full=n fromuser=yh1 touser=yh2;
2：多表更新
update table1 a set a.column1=(select b.column1 from table2 b
where a.column2=b.2column2)
where a.column3 is not null;
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