But most simple databases don't require the full range of allowed types, and often they need to store only numerical, character, and date or time data.
但是最简单的数据库并不要求使用所有允许的类型，通常只需要保存数值型、字符型和日期(或时间)数据。
Different types of values exist such as character string, date, decimal, and so on.
存在不同类型的值，如字符串、日期(date)、小数(decimal)等。
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