after you have configured jvm,sshd service with no private key authorized and hadoop .you can install the hive a dw tools based on the hadoop platform.It's a little different from the SQL,now let's start the basic hive ql.
HIVE QL
4.1DDL
显示数据库：showdatabases;
建数据库createdatabase db1;
切换数据库：usedb1;
显示所有表showtables;
显示一部分表名匹配的表 ：SHOW TABLES '.*s';
建表：
CREATE TABLE invites (foo INT, bar STRING)[ PARTITIONED BY (ds STRING)];
查看表结构
DESCRIBE 表名
修改表列名
Alter table PERSON age to age1
增加表列
Alter table PERSON add columns (ageINT);
删除表DROPTABLE表名;
4.2DML
导入数据：
LOAD DATA INPATH ‘文件地址' OVERWRITE INTO TABLE表名;
4.3SQL
SELECTS and FILTERS
SELECT a.foo FROM invites a WHEREa.ds='2008-08-15';
ORDER BY
SELECT a.foo FROM invites a ORDER BY a.dsdesc/asc
INSERT OVERWRITETABLE表名
[PARTITION(..)]
select语句
GROUP BY
FROM invites a INSERT OVERWRITE TABLEevents SELECT a.bar, count(*) WHERE a.foo > 0 GROUP BY a.bar;
JOIN
FROM pokes t1 JOIN invites t2 ON (t1.bar =t2.bar) INSERT OVERWRITE TABLE events SELECT t1.bar, t1.foo, t2.foo;
多表插入：
From源表名
Insert OVERWRITE table表1名select字句1
Insert OVERWRITE table表2名select字句2
Insert OVERWRITE table表3名select字句3
子查询：
Select * from (select * from … where. …) twhere t.name=’zhangsan’
视图：
Create view 视图名称
As select语句