要將單行和單行顯示多行爲多行？

Question

需要查詢，顯示單排多行

例如：

A，B，C，d，E，F

變化到

甲

乙

C

D

Ë

˚F

查詢，以顯示多個行單列

例如：

甲

乙

Ç

d

Ë

˚F

變化到

A，B，C，d，E，F

Answer 1

逗號/字符串表：How can I select from list of values in Oracle

select column_value from 
    table(sys.dbms_debug_vc2coll('One', 'Two', 'Three', 'Four')); 

SELECT trim(regexp_substr('Err1, Err2, Err3', '[^,]+', 1, LEVEL)) str_2_tab 
    FROM dual 
CONNECT BY LEVEL <= regexp_count('Err1, Err2, Err3', '[^,]+') 
/

逗號/字符串表格：

WM_CONCAT() in 10g as jle mentioned or LISTAGG() in 11g. 

Answer 2

SQL> with t as (
    2 select 'A,B,C,D,E,F' x from dual 
    3 ) 
    4 select substr(x,(rownum-1)*2+1,1) from t 
    5 connect by level <= regexp_count(x,',')+1 
    6/

S                    
-                    
A                    
B                    
C                    
D                    
E 
F  

SQL> with t as (
    2 select 'A,B,C,D,E,F' x from dual 
    3 ) 
    4 select listagg(s,',') within group (order by s) str 
    5 from (
    6 select substr(x,(rownum-1)*2+1,1) s from t 
    7 connect by level <= regexp_count(x,',')+1 
    8 ) 
    9/

STR                    
--------------- 
A,B,C,D,E,F