Yes or No fields
Click a Yes or No field to select the option or to deselect it.
The field is:
Turned on when a check mark is shown in the box, which corresponds to Yes.
Turned off when there is no check mark, which corresponds to No.
Note: When you import Yes or No fields from a text file into SQL Server databases, blank values are interpreted as 'No'. This is useful where a Yes or No field is left blank for 'No'.
In some situations, for example when you are trying to Find records, there is a third setting that means either.