臥式的方式獲得結果在Oracle

Question

我寫查詢

select s_id from emp 
where s_inv=12 

我得到這樣

1 
2 
3 
4 
5 

的結果，但我想在這種格式

1 2 3 4 5 

Answer 1

如果您需要您的結果列於單列中，您可以使用LISTAGG：

with emp(s_id, s_inv) as 
(
    select 1, 12 from dual union all 
    select 2, 12 from dual union all 
    select 3, 12 from dual union all 
    select 4, 12 from dual union all 
    select 5, 12 from dual 
) 
select listagg(s_id, ' ') within group (order by s_id) 
from emp 
where s_inv = 12 

如果您需要在同一行建立多列，你應該先確定有多少列將你的結果有