请问聚合模型不支持count()吗

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我司有大量需求是分组统计数量，比如 select count(*) as num from xxx group by vin

hz19851
1 Answers

聚合模型支持count()的，参考示例：

select count(user_id) from test_agg group by user_id;

CREATE TABLE test_agg
(
    `user_id` LARGEINT NOT NULL COMMENT "用户id",
    `date` DATE NOT NULL COMMENT "数据灌入日期时间",
    `city` VARCHAR(20) COMMENT "用户所在城市",
    `age` SMALLINT COMMENT "用户年龄",
    `sex` TINYINT COMMENT "用户性别",
    `last_visit_date` DATETIME REPLACE DEFAULT "1970-01-01 00:00:00" COMMENT "用户最后一次访问时间",
    `cost` BIGINT SUM DEFAULT "0" COMMENT "用户总消费",
    `max_dwell_time` INT MAX DEFAULT "0" COMMENT "用户最大停留时间",
    `min_dwell_time` INT MIN DEFAULT "99999" COMMENT "用户最小停留时间"
)
AGGREGATE KEY(`user_id`, `date`, `city`, `age`, `sex`)
DISTRIBUTED BY HASH(`user_id`) BUCKETS 1
PROPERTIES (
"replication_allocation" = "tag.location.default: 1"
);


insert into test_agg values
(10000,"2017-10-01","北京",20,0,"2017-10-01 06:00:00",20,10,10),
(10000,"2017-10-01","北京",20,0,"2017-10-01 07:00:00",15,2,2),
(10001,"2017-10-01","北京",30,1,"2017-10-01 17:05:45",2,22,22),
(10002,"2017-10-02","上海",20,1,"2017-10-02 12:59:12",200,5,5),
(10003,"2017-10-02","广州",32,0,"2017-10-02 11:20:00",30,11,11),
(10004,"2017-10-01","深圳",35,0,"2017-10-01 10:00:15",100,3,3),
(10004,"2017-10-03","深圳",35,0,"2017-10-03 10:20:22",11,6,6);
黄海军@SelectDB3718