Template:Unique values

Template documentation

partial query to select all items with a unique value for a property.

Naming

Same convention of {{Multiple values}} : ?<itemname>_<property>_val1 for the default value of the statement

Usage

Items with a unique instance of (P31) value

{{sparql|query=
select ?item {
    {{unique values|instance of|?item}}
} limit 1000
}}

select ?item {  
     
     ?item wdt:P31  ?item_instance_of_val1
                        filter not exists { 
                          ?item wdt:P31  ?item_instance_of_val2
                        filter (?item_instance_of_val1 != ?item_instance_of_val2) .
                        }
 } limit 1000

Try it!

See also

• {{Multiple values}}
• {{No value}}

Partial query that filters items that have a unique value for a property

Template parameters[Edit template data]

Parameter		Description	Type	Status
property	1 property	property for which we search unique values Example P31	Unknown	optional
item	2	item variable or item id Example ?item	Unknown	optional

    ?item wdt:  ?item_{{{1}}}_val1
                       filter not exists { 
                         ?item wdt:  ?item_{{{1}}}_val2
                       filter (?item_{{{1}}}_val1 != ?item_{{{1}}}_val2) .
                       }