Home Database Mysql Tutorial 使用准则进行条件查询--1.3.运行查询前输入参数

使用准则进行条件查询--1.3.运行查询前输入参数

Jun 07, 2016 pm 06:06 PM

使用准则进行条件查询--1.3.运行查询前输入参数


3.运行查询前输入参数 参数查询可以显示一个或多个提示参数值(准则)的预定义对话框。 在要作为参数使用的每一字段下的“准则”单元格中,在方括号内键入相应的提示。此查询运行时,Microsoft Access 将显示该提示。
在这个设计视图中,在日期字段添写了准则:[请输入要查询的日期:]
当查询运行时,先弹出一个对话框,
要求输入参数值,提示信息就是准则中[ ]内的文本。
如果按取消键,查询将终止,不出现查询结果。
查询的运行结果,因为输入的参数为“99-7-15”,
所以只列出了运输日期为1999年7月15日的记录。 在准则中还可以输入更复杂的表达式,比如对于显示日期的字段,在准则中填写“Between [请键入开始日期] And [请键入结束日期]”,运行时将连续出现两个对话框,分别要求输入开始日期和结束日期,结果将显示介于这两个日期之间的记录。
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