The next time it executes, the script will fail since the table already exists-but that's okay.
当再次执行时，脚本将会失败，因为表已经存在—但这也问题不大。
An exception is thrown if the inferred table already exists but with a different namespace, or if any of the inferred columns conflict with existing columns.
如果推断的资料表已经存在，但是具有不同的命名空间，或者如果任何的推断资料行与现有资料行冲突，则会掷回例外状况。
Note: The system fails to create the table if a table with the same name already exists in the user database.
注意：如果这个表格的名称与这个用户数据库中已经存在的名称相同，这个系统就不能创建这个表格。
If you're adding a table or column that already exists, that operation will fail, so you need to make sure your migration is in a consistent state.
如果要添加的表或列已经存在，那么操作就会失败，所以需要确保迁移在一致的状态下运行。
The previous section discussed modifying the data that already exists in a table.
上一节讨论了修改表中现有的数据。
The example assumes that the table customer does not exists and the customer schema is already registered in the database.
以下的示例代码假设表的customer不存在，并且已经在数据库中注册了该customer模式。
Make sure you are not trying to assign a value to a primary key field where the primary key already exists in the data table.
确定您未尝试将值指定至主索引键栏位，而此栏位中的主索引键已存在于资料表中。
Make sure you are not trying to assign a value to a primary key field where the primary key already exists in the data table.
确定您未尝试将值指定至主索引键栏位，而此栏位中的主索引键已存在于资料表中。
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