Hi all, I'm Adrian Bielefeldt an writing on behalf of Research:Understanding Wikidata Queries <https://meta.wikimedia.org/wiki/Research:Understanding_Wikidata_Queries>, a research project aimed at gaining an insight into the way the query service <https://query.wikidata.org/> of wikidata is being used. We have some questions and are wondering if any of you could provide us with an answer.
1. Is there a unique key for the query log? The log I am refering to is the *wdqs_extract* table**from the hive database wmf.**We would like to be able to permanently link our own computed data with the log entry we computed it from. 2. Is it possible to find out if a query in a given log entry was accepted by the sparql endpoint as valid? 3. Is there any other database system besides hive installed on the server? And finally a question on conventions for this mailing list: Am I correct in sending one mail for multiple questions or should I send separate mails for each question? Greetings, Adrian Bielefeldt **
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