Exam C100DBA Topic 5 Question 115 Discussion

Actual exam question for MongoDB's C100DBA exam
Question #: 115
Topic #: 5

Consider the following example document from the sample collection. All documents in this collection have the same schema.

Which of the following queries will replace this with the document.

A. db.sample.update( { "_id" : 3 > , { "_id" : 7 , "c" : 4 , { "$unset" : [ "a" , "b" ] } } ) B. db.sample.update( { "_id" : 3 > , { "_id" : 7 , "c" : 4 > ) C. db.sample.update( { "_id" : 3 > , { "_id" : 7 , "c" : 4 > , { "justOne" : true > ) / This operation cannot be done with a single query. D. db.sample.update( { "_id" : 3 } , { "$set" : { "_id" : 7 , "c" : 4 > > )

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