常用命令
use testdb
whoami
select count(*) from table01;
select * from db2.table01;
创建表
CREATE TABLE table02(
id BIGINT,score DOUBLE);
CREATE TABLE table03(
id BIGINT,PARTITIONED BY (year STRING,zone STRING);
添加分区
ALTER TABLE table03 ADD PARTITION(year='2010',zone='BJ');
ALTER TABLE table03 ADD PARTITION(year='2012',zone='BJ');SELECT * FROM table03 where year='2010' and zone='BJ';
删除分区
ALTER TABLE table03 DROP PARTITION(year='2010',zone='BJ');
查看分区
SHOW PARTITIONS table03;
DROP TABLE table02;DROP TABLE IF EXISTS table02;
DESC table03;
重命名表
ALTER TABLE mytable02 RENAME TO new_table_name
添加列
ALTER TABLE table03 ADD COLUMNS(col_20 STRING,col_21 DOUBLE);
修改列名
ALTER TABLE table03 CHANGE COLUMN old_column_name RENAME TO new_column_name;显示项目空间下的所有表
SHOW TABLES;
查看分区
SHOW PARTITIONS table02;
显示用户创建的实例
SHOW INSTANCES