DDS := AllSchools[AllSchools[Geographic_Region]=~"Darling Downs South West"];

DDS now contains a copy of all rows from the DataFrame AllSchools where the Geographic_Region field is "Darling Downs South West".

I was rather surprised to find I can't copy and paste this line from my Maple datasheet and had to re-type it.
Copying it and pasting it inserts:

DDS := AllSchools[`~`[`=`](AllSchools[Geographic_Region], "Darling Downs South West")];

David Moss