我偷懒了

我偷懒了，在我扬言开始学习的第二天。我带回了笔记本，却没有打开PA教程，看来，在家里学习永远只能是我的一个不错的想法罢了，以后还是在公司多用功吧。

为了证明我没有放弃，还是把我今天的那一点点可怜的笔记发上来吧。

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               today notes
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Unit 4   ABAP Statements and Data Declarations

Types 

 Types可以定义为全局的或本地的

       Local types: 本地使用/只有technical属性没有特定含义的type.

（only technical attributes, not semantic attributes. only used locally）

       Global types: = ABAP Dictionary types, 需要被程序外使用，或有特定含义的type.

             Global types: create on SE11 à Data type à

·	Data elements contain a complete description of the technical attributes of an elementary field, along with semantic information.
·	Structure types can consist of elementary components. Alternatively, each component can itself have a structured type. This allows you to construct nested structure types of any depth you want. Note that you can also use the line type of a transparent table (that is one defined as a database table) as a structured type.
·	Table types are types used to define internal tables.

 SE84(Repository Info System)

 

Local types:

 就这么多吧，Local types部分明天，不，是今天学习。