create table test_01(
name string,
friends array<string>,
children map<string,int>,
address struct<street:string,city:string>)
row format delimited fields terminated by ','
collection items terminated by '_'
map keys terminated by ':'
lines terminated by '\n';
create table student01(id int ,name string)
> row format delimited fields terminated by ','
> stored as textfile location '/user/hive/warehouse/';
create table if not exists student2 (id int ,name string)
row format delimited fields terminated by ',' stored as textfile
location '/user/hive/warehouse/student2';
创建外部表：
create external table dept (deptno int , dname string,loc string) row format delimited fields terminated by '\t';
load data local inpath '/home/hadoop/data/dept.txt' into table dept;
create external table if not exists default.emp(
empno int ,
ename string,
job string ,
mgr int,
hiredate string,
sal double,
comm double,
deptno int)
row format delimited fields terminated by '\t';
load data local inpath '/home/hadoop/data/emp.txt' into table emp;
创建分区：
create table dept_partition(deptno int , dname string,loc string)
partitioned by (month string)
row format delimited fields terminated by '\t';
load data local inpath '/home/hadoop/data/dept.txt' into table default.dept_partition partition(month='201709');
load data local inpath '/home/hadoop/data/dept.txt' into table default.dept_partition partition(month='201708');
load data local inpath '/home/hadoop/data/dept.txt' into table default.dept_partition partition(month='201710');
单分区查询
select * from dept_partition where month='201709';
多分区的联合查询
select * from dept_partition where month='201709'
union
select * from dept_partition where month='201708'
union
select * from dept_partition where month='201707';
添加单个分区：
alter table dept_partition add partition(month='201706');
添加多个分区：
alter table dept_partition add partition(month='201705') partition(month='201704');
删除单个分区：
alter table dept_partition drop partition(month='201704');
删除多个分区：
alter table dept_partition drop partition(month='201705'), partition(month='201706');
查看有多少分区：
show partitions dept_partition;
创建二级分区表：
create table dept_partition2(deptno int , dname string,loc string)
partitioned by (month string,day string)
row format delimited fields terminated by '\t';
load data local inpath '/home/hadoop/data/dept.txt' into table default.dept_partition2 partition(month='201710',day='10');
select * from dept_partition2 where month='201709' and day='13';