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关系型数据库管理系统特点：体积小、速度快、总体拥有成本低、开放源码 指令 作用 sudo apt-get install mysql-server 安装MySQL服务端、核心程序 sudo apt-get install mysql-client 安装MySQL客户端 sudo service mysql start 打开MySQL服务 mysql -u root

183. Customers Who Never Order Suppose that a website contains two tables, the Customers table and the Orders table. Write a SQL query to find all customers who never order anything. Table: Cust