All of the above can be conditional upon the operating system type and revision, time of day, arbitrary user-defined classes, presence or absence of files, directories, or data in files, and so on.
上述所有这些根据操作系统类型和修订版本、一天中的时间、任意用户定义的类、文件中文件、目录或数据的有无等等可以是有条件的。
A structured data type is a form of user-defined data type that contains a sequence of attributes, each of which has a data type.
结构化数据类型是一种用户定义的数据类型，它包含了一系列的属性，每一个属性都有一个数据类型。
Prior to this release, the declared temporary table (DGTT) was the only type of user-defined temporary table.
在此发行版之前，已声明的临时表(DGTT)是唯一的一种用户定义的临时表。
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