仅供参考：条件判断语句：Conditions Decision StructuresDecision StructuresVisual Basic procedures can test conditions and then, depending on the results of that test, perform different operations. The decision structures that Visual Basic supports include: If...Then If...Then...Else Select Case If...Then 数据访问：Data Access Opens the Visual Data Manager application so you can access and manage data.
If...Then...Else
Select Case
If...Then
数据访问：Data Access
Opens the Visual Data Manager application so you can access and manage data.