如何快速使用Doris - E-MapReduce

本文主要通過樣本為您介紹，如何快速使用E-MapReduce上的Doris叢集進行基本的建表和查詢操作。

前提條件

已建立Doris叢集，詳情請參見建立Doris叢集。

使用樣本

使用SSH方式登入叢集，詳情請參見登入叢集。
主節點的公網IP地址：需要您在新版控制台節點管理頁簽的emr_master機器組下查看。
執行以下命令，串連叢集。
```
mysql -h127.0.0.1  -P 9031 -uroot
```
執行以下命令，建立資料庫並選擇資料庫。
```
CREATE DATABASE IF NOT EXISTS load_test;
USE load_test;
```

執行以下命令，建立表。

CREATE TABLE insert_wiki_edit
(
    event_time DATETIME,
    channel VARCHAR(32) DEFAULT '',
    user VARCHAR(128) DEFAULT '',
    is_anonymous TINYINT DEFAULT '0',
    is_minor TINYINT DEFAULT '0',
    is_new TINYINT DEFAULT '0',
    is_robot TINYINT DEFAULT '0',
    is_unpatrolled TINYINT DEFAULT '0',
    delta INT SUM DEFAULT '0',
    added INT SUM DEFAULT '0',
    deleted INT SUM DEFAULT '0'
)
AGGREGATE KEY(event_time, channel, user, is_anonymous, is_minor, is_new, is_robot, is_unpatrolled)
PARTITION BY RANGE(event_time)
(
    PARTITION p06 VALUES LESS THAN ('2015-09-12 06:00:00'),
    PARTITION p12 VALUES LESS THAN ('2015-09-12 12:00:00'),
    PARTITION p18 VALUES LESS THAN ('2015-09-12 18:00:00'),
    PARTITION p24 VALUES LESS THAN ('2015-09-13 00:00:00')
)
DISTRIBUTED BY HASH(user) BUCKETS 10
PROPERTIES("replication_num" = "1");

執行以下命令，匯入測試資料。

INSERT INTO insert_wiki_edit VALUES("2015-09-12 00:00:00","#en.wikipedia","GELongstreet",0,0,0,0,0,36,36,0),("2015-09-12 00:00:00","#ca.wikipedia","PereBot",0,1,0,1,0,17,17,0);

執行以下命令，查詢資料。

select * from insert_wiki_edit;

返回資訊如下所示。

+---------------------+---------------+--------------+--------------+----------+--------+----------+----------------+-------+-------+---------+
| event_time          | channel       | user         | is_anonymous | is_minor | is_new | is_robot | is_unpatrolled | delta | added | deleted |
+---------------------+---------------+--------------+--------------+----------+--------+----------+----------------+-------+-------+---------+
| 2015-09-12 00:00:00 | #en.wikipedia | GELongstreet |            0 |        0 |      0 |        0 |              0 |    36 |    36 |       0 |
| 2015-09-12 00:00:00 | #ca.wikipedia | PereBot      |            0 |        1 |      0 |        1 |              0 |    17 |    17 |       0 |
+---------------------+---------------+--------------+--------------+----------+--------+----------+----------------+-------+-------+---------+
2 rows in set (0.07 sec)