1、列转行：
数据准备：
create table STUDENTSCORES
(
username VARCHAR2(20),
subject VARCHAR2(30),
score NUMBER(10,2)
)
insert into STUDENTSCORES (USERNAME, SUBJECT, SCORE)
values ('张三', '语文', 80.00);
insert into STUDENTSCORES (USERNAME, SUBJECT, SCORE)
values ('张三', '数学', 90.00);
insert into STUDENTSCORES (USERNAME, SUBJECT, SCORE)
values ('张三', '英语', 70.00);
insert into STUDENTSCORES (USERNAME, SUBJECT, SCORE)
values ('张三', '生物', 85.00);
insert into STUDENTSCORES (USERNAME, SUBJECT, SCORE)
values ('李四', '语文', 80.00);
insert into STUDENTSCORES (USERNAME, SUBJECT, SCORE)
values ('李四', '数学', 92.00);
insert into STUDENTSCORES (USERNAME, SUBJECT, SCORE)
values ('李四', '英语', 76.00);
insert into STUDENTSCORES (USERNAME, SUBJECT, SCORE)
values ('李四', '生物', 88.00);
insert into STUDENTSCORES (USERNAME, SUBJECT, SCORE)
values ('码农', '语文', 60.00);
insert into STUDENTSCORES (USERNAME, SUBJECT, SCORE)
values ('码农', '数学', 82.00);
insert into STUDENTSCORES (USERNAME, SUBJECT, SCORE)
values ('码农', '英语', 96.00);
insert into STUDENTSCORES (USERNAME, SUBJECT, SCORE)
values ('码农', '生物', 78.00);
列转行实现：
SELECT * FROM StudentScores /*数据源*/
PIVOT
( sum(Score)/*行转列后 列的值*/
for Subject /*需要行转列的列*/ in ('语文','数学','英语','生物' 生物,'物理' /*列的名称*/)
)
加条件：
select * from (
SELECT * FROM StudentScores t where t.score>60 /*数据源*/
）
PIVOT
( sum(Score)/*行转列后 列的值*/
for Subject /*需要行转列的列*/ in ('语文','数学','英语','生物' 生物,'物理' /*列的名称*/)
)
2、行转列：
CREATE TABLE ProgrectDetail
(
ProgrectName VARCHAR(20), --工程名称
OverseaSupply number(10), --海外供应商供给数量
NativeSupply number(10), --国内供应商供给数量
SouthSupply number(10), --南方供应商供给数量
NorthSupply number(10) --北方供应商供给数量
)
INSERT INTO ProgrectDetail
SELECT 'A', 100, 200, 50, 50 from dual
UNION ALL
SELECT 'B', 200, 300, 150, 150 from dual
UNION ALL
SELECT 'C', 159, 400, 20, 320 from dual
实现：
SELECT *
FROM ProgrectDetail
UNPIVOT
(
SupplyNum FOR Supplier IN --
(OverseaSupply, NativeSupply, SouthSupply, NorthSupply )
) P
