oracle 拼接备忘录

execute immediate 'alter session set nls_date_format=''yyyy-mm-dd''';execute immediate 'insert into '|| v_mig_tablename||  ' select * from '||v_addUser_tablename||' o '||  ' where o.'||coldate||' < ' ||''''||v_3Month_dateTime||''''||  ' and rownum < =10000';