clickhouse创建物化视图SQL语句

1.上半部分是创建物化视图的建表语句，下半部分是将哪些数据更新到物化视图中；

2. 如果是创建普通视图只需将下半部分中的 MATERIALIZED 字段去掉即可；

CREATE TABLE south.alarm_daily_statistics (
 `alarm_time` DateTime DEFAULT CAST(1970-01-01 00:00:01,
 DateTime),
 `vehicle_no` String,
 `owers_id` Int16,
 `owers_name` String,
 `alarmNumber` Int16
) ENGINE = MergeTree() PARTITION BY toYYYYMM(alarm_time) ORDER BY (alarm_time, owers_id) SETTINGS index_granularity = 8192;
CREATE MATERIALIZED VIEW south.alarm_daily_statistics_vim TO south.alarm_daily_statistics AS SELECT
		toDate( a.alarm_time ) AS alarm_time,
        a.device_id as vehicle_no,
        max(owers_id) as owers_id,
		max(owers_name) as owers_name,
        count((CASE WHEN ( `a`.`alarm_source` = 2 ) THEN 1 END )) AS `alarmNumber`
        FROM
        alarm_info a
        GROUP BY
        alarm_time,
        device_id
        ORDER BY
        alarm_time,
        device_id;