ClickHouse（二）-导入数据

导入数据

准备数据

http://files.grouplens.org/datasets/movielens/
movieslens数据集，ratings.csv 26024314条数据

上手
链接clickhouse

docker exec -it  ch-server /bin/bash

clickhouse-client

建表

CREATE TABLE ratings(userId Int64,  moveId Int64,  rating Float64, tm Int64) ENGINE = Log;

导入

cat /ratings.csv | clickhouse-client --query="INSERT INTO ratings FORMAT CSV";

查询

SELECT count(1) FROM ratings 

┌─count(1)─┐
│ 26024314 │
└──────────┘

0.166 秒

select rating,count(1) from ratings group by rating order by count(1);

┌─rating─┬─count(1)─┐
│    1.5 │   403607 │
│    0.5 │   404897 │
│      1 │   843321 │
│    2.5 │  1255358 │
│      2 │  1762440 │
│    4.5 │  2170443 │
│    3.5 │  3116214 │
│      5 │  3812505 │
│      3 │  5256722 │
│      4 │  6998807 │
└────────┴──────────┘

0.78秒

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