Home Database Mysql Tutorial 2013年计算机等级考试二级Access第二章精讲10

2013年计算机等级考试二级Access第二章精讲10

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

操作表 查找数据 查找指定内容 在数据表视图中,使用编辑菜单中的查找命令 查找空值或空字符串 空值是字段中还没有值,可用Null值代替 空字符串是用双引号括起来的空字符串,即,中间没有空格,长度为0 替换数据 在数据表视图中,使用编辑菜单中的替换命令。 1、

操作表

 查找数据

查找指定内容

在“数据表”视图中,使用编辑菜单中的查找命令

查找空值或空字符串

空值是字段中还没有值,可用Null值代替

空字符串是用双引号括起来的空字符串,即””,中间没有空格,长度为0

 

  替换数据

在“数据表”视图中,使用编辑菜单中的替换命令。

1、替换指定内容

2、更改默认设置

  排序记录

排序记录时,不同的字段类型,排序规则有所不同,具体规则如下:
    (1)英文按字母顺序排序,大小写视为相同,升序时按A到z排列,降序时按z到A排列。
    (2)中文按拼音的顺序排序,升序时按A到z排列,降序时按z到A排列。
    (3)数字按数字的大小排序,升序时从小到大排列,降序按从大到小排列。
    (4)使用升序排序日期和时间,是指由较前的时间到较后的时间;使用降序排序时,则是指由较后的时间到较前的时间。
  排序时,要注意的事项如下:
    (1)在“文本”字段中保存的数字将作为字符串而不是数值来排序。因此,如果要以数值的顺序来排序,必须在较短的数字前面加上零,使得全部文本字符串具有相同的长度。例如:要以升一序来排序以下的文本字符串“1”、“2”、“11”和“22”,其结果将是“1”、“11”、“2”、“22”。必须在仪有一位数的字符串前面加上零,才能正确地排序:“01”、“02”、“11”、“22”。对于不包含Null值的字段,另一个解决方案是使用V al函数来排序字符串的数值。例如:如果“年龄”列是包含数值的“文本”字段,在“字段”单元格指定V al([年龄]),并且在“排序”单元格指定排序次序后,才会以正确的顺序来放置记录。如果只在“文本”字段之中保存数字或日期,可以考虑将表的数据类型更改为数字、货币或日期/时间。这样在对此字段排序时,数字或日期将会以数值或日期的顺序来排序,而不需要加入前面的零。
    (2)在以升序来排序字段时,任何含有空字段(包含Null值)的记录将列在列表中的第一条。如果字段中同时包含Null值和空字符串,包含Null值的字段将在第一条显示,紧接着是空字符串。

筛选记录 

1.按选定内容筛选 

p 筛选符合单值的记录

2.按窗体筛选  

p 筛选符合两个以上值的记录

3.按筛选目标筛选

p 筛选符合某条件的记录

4.高级筛选  

p 筛选满足复杂条件的记录

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