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A query variable is marked by the use of either "?" or "$"; the "?" or "$" is not part of the variable name. In a query, $abc and ?abc identify the same variable.

In this book only variables marked with "?" are used.

Allowable characters are [a-z], [A-Z], [0-9], _, · and also diacrictics like áéíóú etcetera.


SELECT $child_of_Bach $child_of_BachLabel
  $child_of_Bach wdt:P22 wd:Q1339.
  SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }

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