Hive 基本操作

1-hive hql基本操作

2-hive的內部表和外部表

3-分割槽表

create database test;

show databases;

create table student(classno string, stuno string, score int) row format delimited

fields terminated by ',';

c01,n0101,82

c01,n0102,59
c01,n0103,65
c02,n0201,81
c02,n0202,82
c02,n0203,79
c03,n0301,56
c03,n0302,92
c03,n0306,72

load data local inpath '/root/tmp/student.txt'overwrite into table student;

這個命令將student.txt檔案複製到hive的warehouse目錄中，這個目錄由hive.metastore.warehouse.dir配置項設定，預設值為/user/hive/warehouse。overwrite選項將導致hive事先刪除student目錄下所有的檔案, 並將檔案內容對映到表中。 hive不會對student.txt做任何格式處理，因為hive本身並不強調資料的儲存格式。

hive>select * from student;

hive>select classno,count(score) from student where score>=60 group by classno;

load data local inpath '/root/tmp/student.txt' overwrite into table student2;

desc formatted table_name;

drop table student;

select * from student2;

tom,4300

jerry,12000
mike,13000
jake,11000
rob,10000

create table employee (name string,salary bigint) partitioned by (date1 string) row

format delimited fields terminated by ',' lines terminated by '\n' stored as textfile;

show partitions employee;

alter table employee add if not exists partition(date1='2018-12-01');

load data local inpath '/root/tmp/employee.txt' into table employee partition(date1='2018-12-01');

hadoop fs -mkdir /user/hive/warehouse/emp/dt=2018-12-04

hadoop fs -copyfromlocal /root/tmp/employee.txt /user/hive/warehouse/test.db/emp/dt=2018-12-04/employee.txt

alter table employee add if not exists partition(dt='2018-12-04');

動態分割槽

create table employee2 (name string,salary bigint) partitioned by (date1 string) row

format delimited fields terminated by ',' lines terminated by '\n' stored as textfile;

insert into table employee2 partition(date1) select name,salary,date1 from employee;

set hive.exec.dynamic.partition.mode=nonstrict;

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