The basic concept of using enumerated types is simple.
使用枚举类型的基本概念很简单。
Simple searches and transactions affecting single rows and single tables, and modification of basic field types should not cause any errors.
影响个别行和表的简单查询和事务，以及修改基本的字段类型可能不会产生错误。
Basic data types are fairly easy to access because they have a very simple syntax.
访问基本数据类型相当容易，因为语法非常简单。
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