您将使用这些命令来创建、读取、更新或者删除数据库中的记录。

You will use these commands to create, read, update, or delete records from your database.

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DDL命令用来创建、修改或删除数据库中的项目(例如表)。

DDL commands are used to create, modify, or delete items (such as tables) in a database.

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可以在同一个命令上同时指定添加和删除数据库分区，但是必需先添加，后删除。

You might specify to both add and drop database partitions on the same command but the add must come before the drop.

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