Sql 如何在Oracle中将多列转换为一列
我的结果如下:Sql 如何在Oracle中将多列转换为一列,sql,oracle,Sql,Oracle,我的结果如下: level_1_node level_2_node level_3_node level_4_node Node 1 Node2 Node 3 Node 4 我想将其转换为: Node Node 1 Node 2 Node 3 Node 4 怎么做?你可以使用 select "level_1_node" as Node from Table1 union select "level_2_node" as Node from Table1
level_1_node level_2_node level_3_node level_4_node
Node 1 Node2 Node 3 Node 4
我想将其转换为:
Node
Node 1
Node 2
Node 3
Node 4
怎么做?你可以使用
select "level_1_node" as Node from Table1
union
select "level_2_node" as Node from Table1
union
select "level_3_node" as Node from Table1
union
select "level_4_node" as Node from Table1
您可以使用
select "level_1_node" as Node from Table1
union
select "level_2_node" as Node from Table1
union
select "level_3_node" as Node from Table1
union
select "level_4_node" as Node from Table1
使用表格运算符:
select "level_1_node" as Node from Table1
union
select "level_2_node" as Node from Table1
union
select "level_3_node" as Node from Table1
union
select "level_4_node" as Node from Table1
select value
from tablename
unpivot
(
value
for node in (level_1_node,
level_2_node,
level_3_node,
level_4_node)
);
select value
from tablename
unpivot
(
value
for node in (level_1_node,
level_2_node,
level_3_node,
level_4_node)
);