query: Mongodb $exists query produces empty result
positive_passages.docid: 145750
positive_passages.text: mongodb $exists always returning 0
negative_passages.docid: 155283
negative_passages.text: Best way to check if object exists in Entity Framework?
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negative_passages.text: How to check if a value already exists to avoid duplicates?
negative_passages.docid: 6988
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negative_passages.text: Check if MongoDB upsert did an insert or an update
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negative_passages.text: Best way to test for a variable's existence in PHP; isset() is clearly broken
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negative_passages.text: Why do I get the MySQL Error "Query was empty"?
negative_passages.docid: 71657
negative_passages.text: Can you specify a key for $addToSet in Mongo?
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negative_passages.text: how to make Correctly a javascript if exist (folder) command?
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negative_passages.text: What is the maximum number of parameters passed to $in query in MongoDB?