Hive - 行转列,列转行
行转列(多行转一行)

1、创建表,并插入示例数据。
create table students_info
(`SNO` string comment '学生编号',
`name` string comment '姓名',
`DEPART` string comment '选修课程'
)
--学生信息表数据插入
insert into students_info values
(103,'张三','心理学'),
(103,'张三','Java'),
(105,'王五','Spark'),
(109,'李麻子','Flink'),
(109,'李麻子','Kylin');
select * from students_info
2、行转列
select
max(sno),
name,
concat_ws(',', collect_set(DEPART)) as DEPART
from students_info
group by name
列转行