(20210303)docker clickhouse 初阶使用

• Overview

  文中大部分内容都可以从官方docs中找到，这里只是以docker为主线梳理细分领域的操作。

• 安装

  官方image

  可能遇到的问题：

  (20210302已解决)docker启动clickhouseInclude not found clickhouse_remote_servers

  (20210302已解决)WARNING Found orphan containers for this project

  (20210302已解决)clickhouse docker, as it does not belong to the default network

  理解Creating network “projectName_default” with the default driver

• 基本命令

  因为套了一层，因此docker container没有官方文档中的命令那么灵活。

  $ SHOW DATABASE;	# 查看有哪些数据库
  $ SHOW TABLES FROM databaseName	# 查看某数据库里有哪些表格
  $ DESCRIBE TABLE tableName		# 查看某表的schema, 只写表名默认是default.tableName
  $ DESCRIBE TABLE dbName.tableName
  $ SHOW CREATE TABLE dbName.tableName	# much more details of table
  
  # ****************Database**********************
  $ CREATE DATABASE IF NOT EXISTS tutorial	# 创建
  $ SHOW DATABASES							# 查看
  $ DESCRIBE TABLE db.table 
  # ****************Tables************************
  $ CREATE TABLE tutorial.nestedt ( `id` UInt8, `aux` Nested(a UInt8, b String))ENGINE=TinyLog
  # ****************Import Data*******************
  $ INSERT INTO tutorial.nestedt Values (1, [1], ['a'])
  # ****************Select Data*******************
  $ SELECT * FROM tutorial.nestedt FORMAT TSV
  $ SELECT COUNT(*) FROM tutorial.nestedt
  # ****************Settings**********************
  $ SELECT name,value, changed, description FROM system.settings WHERE name LIKE '%max_insert_b%' FORMAT TSV	# 查看设置
  # ****************Optimize**********************
  $ OPTIMIZE TABLE tutorial.nestedt FINAL
  

• create table

  Syntax for creating tables is way m ore complicated compared to databases. In general CREATE TABLE statement has to specify three key things:

  • Name of table to create
  • Table schema, i.e. list of columns and their data types
  • Table engine and its setting, which determines all the details on how queries to this table will physically executed

• References

1. ClickHouse Docs