生成自然順序，和自定義順序的編號
select 'e' || trim(to_char(nvl(a, 0), '00000000')) customer_id--固定位數填充
from (select t.a, t1.a b
from (select rownum a
from dual
connect by rownum <=
(select max(to_number(replace(customer_id, 'e', ''))) + 2
from tb_cus_firm
where customer_id like 'e%')) t,
(select to_number(replace(customer_id, 'e', '')) a
from tb_cus_firm
where customer_id like 'e%') t1
where t.a not like '%4%' and t.a = t1.a(+))
where b is null and rownum = 1
解析：select a,rownum
from (select t.a, t1.a b
from (select rownum a
from dual
connect by rownum <=
(select max(to_number(replace(customer_id, 'e', ''))) + 2
from tb_cus_firm
where customer_id like 'e%')) t,
(select to_number(replace(customer_id, 'e', '')) a
from tb_cus_firm
where customer_id like 'e%') t1
where t.a not like '%4%' and t.a = t1.a(+))
/*where b is null*/ /*and rownum = 1*/ rownum是根據當前的結果集在作用域內變化，這句就保證了跳過之後還從未用的順序開始
同樣的兩列比較：取理論上對比實際為null的那些的第乙個
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