2012年计算机二级Access辅导笔记之建造Access表
第四章 建造 Access表 4.1 Access数据库表概述 一,表的组成 字段 字段的数据类型 字段的属性 字段的声名 二,表的视图 设计视图 数据表视图 数据透视表视图和数据透视图视图 1. 字段 字段名称要能够直接,清嚣张的反映信息内容 字段命名划定(同样适合于控件和
一,表的组成
字段
字段的数据类型
字段的属性
字段的声名
二,表的视图
设计视图
数据表视图
数据透视表视图和数据透视图视图
1. 字段
字段名称要能够直接,清嚣张的反映信息内容
字段命名划定(同样适合于控件和对象):
长度不能跨越64个西文字符(32个汉字);
不能包含句号".",感伤号"!",重音符号和方括号"";
不能以空格开首;
不能包含节制字符(0～31的ASCII值);;
最好确保字段名和Access中已有的属性和其他元素的名称不不异.
2. 字段的数据类型
合理选择字段的数据类型,可有用的提高数据库效率,并可避免一些错误的发生.
例:2002年5月14日
8
日期或时刻
日期(Date/Time)
货泉值除外
8
用来算术计较的数值
数字(Num)
注释,声名
65 536
长文本或文本与数字的组合
备注(Memo)
地址,电话号码,学号
255
文鼻橐恺字与文本组合,或不需要计较的数字
文本(Text)
备注
存储空间(字节)
合用规模
数据类型
表4-1 字段的数据类型
UNC,URL路径
64 000
用于超链接
超链接(Hyperlink)
例:Word,Excel文件
1GB
用于使用OLE和谈在其它轨范中建树的OLE对象
OLE对象(OLEObject)
是/否(Yes/No)
此类型字段不能更新
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