Find duplicate values in Semantic MediaWiki -

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How do I list any duplicate values ​​for the property in Semantic MediaWiki? A MySQL query is fine, it is not through an SMW query.

I found a way that works for me:

with installed , Create a template {{duplicate search}} like this: 

  {{ifeq: {{# var: a}} | {{# Vardefineecho: a | {{{2 |}}}}} | & Lt ;! - Duplicate found! Print some messages: - & gt; Duplicate found: {{{2}}}   
 and ask the value like this:  
  {{# ask: [[MyProperty :: +]] | | MyProperty | Sort = MyProperty | Format = template | Template = Detect duplicates}}   
 It is important to sort out the results before sending them to the template, because the duplicate has to come to each other.

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