Home Database Mysql Tutorial 2013年计算机等级考试二级Access第二章精讲4

2013年计算机等级考试二级Access第二章精讲4

Jun 07, 2016 pm 03:02 PM
access Level 2 computer

设置字段属性 字段属性表示字段所具有的特性,它定义了字段数据的保存、处理或显示。 1.字段大小 p字段大小属性用于限制输入到该字段的最大长度,当输入的数据超过该字段设置的字段大小时,系统将拒绝接收。 p字段大小属性只适用于文本、数字或自动编号类型

设置字段属性 

字段属性表示字段所具有的特性,它定义了字段数据的保存、处理或显示。 

1.字段大小

p 字段大小属性用于限制输入到该字段的最大长度,当输入的数据超过该字段设置的字段大小时,系统将拒绝接收。  

p 字段大小属性只适用于文本、数字或自动编号类型的字段。 自www.Examw.com

p 在设计视图的字段属性框的字段大小属性中选择字段大小的类型(数字)或输入字段大小的字符个数(文本)。

p 如果文本字段中已经有数据,那么减小字段大小会造成数据丢失,Access将截去超出新限制的字符。

p 如果在数字字段中包含小数,那么将字段大小属性设置为整数时,Access自动将小数取整。

p 如果文本型字段的值是汉字,那么每个汉字占一位。 

2.格式

p 格式属性影响数据的显示格式。 

p 可确定数字、货币、日期等字段格式。

p 在设计视图的字段属性框的字段格式属性中选择字段格式的类型。

3.输入掩码

p 用于指定数据的输入格式。

p 可定义文本、数字、日期/时间、货币等数据类型的字段。 

p 如果为某字段定义了输入掩码,同时又设置了它的格式属性,格式属性将在数据显示时优先于输入掩码的设置。

p 只为文本型和日期/时间型字段提供向导。

p 可使用字符定义输入掩码属性。中华考试网(www.Examw。com)

p 输入掩码属性由字面字符(如空格、点、括号等)和决定输入数值的类型的特殊字符组成。 

 

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