问题描述
我在 Oracle 表 (tab1) 中有以下示例数据，我正在尝试将行转换为列.我知道如何在一列上使用 Oracle 数据透视表.但是是否可以将其应用于多列?
I have the following sample data in an Oracle table (tab1) and I am trying to convert rows to columns. I know how to use Oracle pivot on one column. But is it possible to apply it to multiple columns?
样本数据:
Type weight height
A 50 10
A 60 12
B 40 8
C 30 15
我的预期输出:
A-count B-count C-count A-weight B-weight C-weight A-height B-height C-height
2 1 1 110 40 30 22 8 15
我能做什么:
with T AS
(select type, weight from tab1 )
select * from T
PIVOT (
count(type)
for type in (A, B, C, D,E,F)
)
上面的查询给了我下面的结果
The above query gives me the below result
A B C
2 1 1
我可以用 sum(weight) 或 sum(height) 替换 count(*) 以旋转高度或重量.我想做但我不能做的是在一个查询中以所有三个(计数、重量和高度)为中心.
I can replace count(*) with sum(weight) or sum(height) to pivot height or weight. What I am looking to do, but I can't do, is pivot on all three (count, weight and height) in one query.
可以使用pivot来完成吗?
Can it be done using pivot?
推荐答案
As 文档显示，您可以有多个聚合函数子句.所以你可以这样做:
As the documentation shows, you can have multiple aggregate function clauses. So you can do this:
select * from (
select * from tab1
)
pivot (
count(type) as ct, sum(weight) as wt, sum(height) as ht
for type in ('A' as A, 'B' as B, 'C' as C)
);
A_CT A_WT A_HT B_CT B_WT B_HT C_CT C_WT C_HT
---- ---- ---- ---- ---- ---- ---- ---- ----
2 110 22 1 40 8 1 30 15
如果您希望列按您显示的顺序排列，请添加另一个级别的子查询:
If you want the columns in the order you showed then add another level of subquery:
select a_ct, b_ct, c_ct, a_wt, b_wt, c_wt, a_ht, b_ht, c_ht
from (
select * from (
select * from tab1
)
pivot (
count(type) as ct, sum(weight) as wt, sum(height) as ht
for type in ('A' as A, 'B' as B, 'C' as C)
)
);
A_CT B_CT C_CT A_WT B_WT C_WT A_HT B_HT C_HT
---- ---- ---- ---- ---- ---- ---- ---- ----
2 1 1 110 40 30 22 8 15
SQL 小提琴.
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