如果无法使用pl/sql developer中，工具->导出用户对象功能
declare
cursor cemp is select table_name from all_tables where owner = 'USERNAME';
tbn all_tables.table_name%type;
col_num int ;
begin
open cemp;
loop
fetch cemp into tbn;
exit when cemp%notfound;
select count(1) into col_num from all_tab_columns T1 where owner = 'USERNAME' and Table_Name= tbn ;
insert into temp_USERNAME_tables
select case
when rn=1 and 1 = col_num then
'CREATE TABLE ' ||tbn || ' ( ' || COLUMN_NAME || ' '|| DATA_TYPE || ' );'
when rn=1 and 1 <> col_num then
'CREATE TABLE ' ||tbn || ' ( ' || COLUMN_NAME || ' '|| DATA_TYPE || ','
when rn=col_num and 1 <> col_num then
COLUMN_NAME || ' ' || DATA_TYPE || ' );'
else
COLUMN_NAME || ' ' || DATA_TYPE || ','
end create_table
from (select rownum rn,
T1.COLUMN_NAME,
T1.DATA_TYPE || '(' || T1.DATA_LENGTH || ') ' as DATA_TYPE
from all_tab_columns T1
where owner = 'USERNAME'
and Table_Name = tbn ) r1;
end loop;
close cemp;
end;