Survey Tabulation > Advanced expressions > Operators > Categorical set logic > Union
 
Union
The union (+) operator performs a union of two category lists. The response order from the category list on the left is maintained above the one on the right.
Examples
Result
{5,2,1,8,6} + {1,5,3,9,7}
{5,2,1,8,6,3,9,7}
{FOSSILS, BIRDS, WHALES} + {WHALES, BIRDS, FOSSILS}
{FOSSILS, BIRDS, WHALES}
{FOSSILS, BIRDS, WHALES} + {MINERALS, ECOLOGY, BIRDS, FOSSILS}
{FOSSILS, BIRDS, WHALES, MINERALS, ECOLOGY}
See also
Categorical set logic