hive建立表、數據庫、分區和分桶及其餘語句

create table ts01(id int,name string);

hive (default)> create table ts02(id int,name string)row format delimited fields terminated by ','、

hive (default)> create table ts03(id int,name string)partitioned by(dt string) row format delimited fields terminated by ',';

hive (default)> create table ts04(id int,name string)partitioned by(dt string,Tm string) row format delimited fields terminated by ',';

注意，這裏dt和tm是子父級的關係，
alter table ts04 add partition(dt='2018-06-03',tm='15-41');
 alter table ts04 add partition(dt='2018-06-03',tm='15-45');

賦值一個表的結構，注意只是從新建立了一個和以前表結構同樣的表，可是不加載前一張表的數據，即新複製出來的表是一張空表
create table ts03 like ts02;

對一張表添加分桶
create table ts05(id int,name string)clustered by(id) into 3 buckets row format delimited fields terminated by ',';
對一張表裏的一個分區添加分桶
create table ts05(id int,name string)partitioned by(dt string) clustered by(id) into 3 buckets row format delimited fields terminated by ',';

清空表中的數據
truncate table ts01;

count（）統計某一列的個數。

hive (default)> select count(name) from ts02;

hive (default)> select distinct count(distinct name) from ts02;