級聯列的值轉換成單獨的列

Question

欲同一列的值連接成單獨的列

假設有列稱爲類型和文本

TYPES TEXT 
A  This is a 
B  This is b 
C  This is c 

我想所需的輸出爲：

Con 
This is c | This is a 
This is c | This is b 

Answer 1

我認爲自加入表可以幫助你：

這是僞代碼

select t.text || tb.text || tc.text 
from t 
inner join t tb using(types) 
inner join t tc using(types) 

所以，來連接A和C柱，你可以嘗試以下操作：

select t.text || tc.text 
from t 
full outer join t tc using(types) 
where t.types = 'A' and tc.types = 'C' 

Answer 2

select concat(t1.text ,' | ', t2.text) from tablename t1 
inner join tablename t2 
on t1.types <> t2.types 

SQL Fiddle