Talk:Q28529690

Finding items[edit | Add topic]

How do I query for "instance of: chemical compound" without a "mass" property? I really tried to modify some of these -- https://www.wikidata.org/wiki/Wikidata:SPARQL_query_service/queries/examples (e.g., "Humans_without_children") -- to work with this goal, but it failed. Proof that item(s) like the aforewritten do/did exist:

• https://www.wikidata.org/w/index.php?title=Q28529690&type=revision&diff=1108911298&oldid=1108910920

Search for <"chemical compound" -mass> doesn't work since text of properties is not seen as text on the page when searching:

• https://www.wikidata.org/w/index.php?sort=relevance&search=%22chemical+compound%22+-mass&title=Special:Search&profile=advanced&fulltext=1&advancedSearch-current=%7B%7D&ns120=1&ns0=1
  • leads to Q27161510 which has a value for the mass property

This works (lead me to this entity), but is probably no all inclusive:

• https://www.google.com/search?q=site%3Ahttps%3A%2F%2Fwww.wikidata.org+%22chemical+compound%22+-mass+-intitle%3A%22talk%22+-intitle%3A%22template%22+-intitle%3A%22wikiproject%22

Other query I did:

• https://query.wikidata.org/#SELECT%20%3Fchem%20%3FchemLabel%20%3Fmass%0AWHERE%0A%7B%0A%20%20%3Fchem%20wdt%3AP31%20wd%3AQ11173%3B%0A%20%20%20%20%20%20%20%20%20%20wdt%3AP2067%20%3Fmass%3B%0A%20%20FILTER%28%3Fmass%20%3C%201500%20%26%26%20%3Fmass%20%3E%201400%29.%0A%20%20BIND%28%3Fmass%20AS%20%3Fmass%29.%0A%20%20SERVICE%20wikibase%3Alabel%20%7B%20bd%3AserviceParam%20wikibase%3Alanguage%20%22%5BAUTO_LANGUAGE%5D%22.%20%7D%0A%7D

--User123o987name (talk) 02:13, 3 February 2020 (UTC)

Hello @User123o987name:,

Feel free to ask your question on Wikidata:Request_a_query, it has a more likely chance to be seen an answered than on an individual item talk page. Lea Lacroix (WMDE) (talk) 08:10, 4 February 2020 (UTC)