如何在访问中定义如果[field1] =“window”，[field2] =“door”，[field3] =“wall”那么[field4] =“building”

Question

如何在访问中定义如果[field1] =“window”，[field2] =“door”，[field3] =“wall”那么[field4] =“Building”

Answer 1

1）创建一个新查询，但不是向设计器添加一个或多个表，而是在右键单击设计器并选择“SQL View”之前取消表选择器（或者，从“views”下拉列表中选择该选项功能区或工具栏最左侧的菜单。）

2）添加以下SQL代码（假设我已正确理解您的伪代码）：

UPDATE MyTableName SET Field4 = 'Building'
WHERE (Field1 = 'Window') And (Field2 = 'door') And (Field3 = 'wall');

3）从功能区或工具栏中选择“运行”（它有一个感叹号图标）。

您也可以使用设计器执行此操作，但我个人觉得直接编写SQL代码更方便。

根据评论更新：根据特定条件以某种方式指定Field4，您可以使用IIf：

UPDATE MyTableName
SET Field4 = IIf(Field3 Is Null, 'Apartment', 'Building')
WHERE (Field1 = 'Window') And (Field2 = 'door') And ((Field3 Is Null) Or (Field3 = 'wall'))

Answer 2

UPDATE MyTableName SET Field4 = 'Building'
WHERE (Field1 = 'Window') And (Field2 = 'door') And ((Field3 Is Null) And (Field3 = 'wall'));