As an example, suppose I have a table such as

that is in the form of a Mathematica Dataset. In Excel I can select rows with specifications such as column a >.6 and column d either g or h. I am able to figure out how to use Select to specify rows for which column a>.6 and column d equal to g, but I have not been able to find the syntax to specify the alternative of column d equal to g or h. Can anyone help me with the correct command?
Thanks.