Haskell中最突出的三种数据结构是：tuple、列表(list)和用户定义的类型。
The three most prominent data structures in Haskell are tuples, lists, and user-defined types.
索引扩展(与用户定义的结构化类型相关)。
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。
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.
类型化表是一个使用用户定义的结构化类型定义的表。
A typed table is a table that is defined with a user-defined structured type.
可以使用用户定义的属性来作为简单的、非结构化和无类型的扩展机制。
You can use user-defined properties as a simple, unstructured and untyped extension mechanism.
对于DB 2索引扩展要注意的一点是对用户定义类型的需求—distinct类型或结构化类型。
One thing to be aware of regarding DB2 index extensions is the requirement for user-defined types - either distinct types or structured types.
用户定义的结构化类型及其转换函数。
User-defined structured types and their transform functions.
用户定义的结构化类型及其转换函数。
User-defined structured types and their transform functions.
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