oracle中如何将单行数据转换为单列 [英] How to convert single row data into a single column in oracle

问题描述

我有一张像:

column1  column2  column3  column4
A        B        C        D

想将其转换为:

Column
A
B
C
D

在oracle中不使用这个联合:

Without using this union all in oracle:

select column1 as Column from dual
union all
select column2 as Column from dual
union all
select column3 as Column from dual
union all
select column4 as Column from dual

推荐答案

您可以尝试使用 取消透视

select v
from (
  SELECT 'A' column1,'B' column2,'C' column3,'D' column4  from dual
) t
unpivot
(
  v  for val in (column1,column2,column3,column4)
) u;

sqlfiddle:https://dbfiddle.uk/?rdbms=oracle_11;小提琴=b2105e1010b332ce5b702eba7bfa7f2d

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