MongoDB
C100DBA · Question #131
Consider the following document: > db.c.find() { "_id" : 12, b : [ 3, 5, 7, 2, 1, -4, 3, 12 ] } Which of the following queries on the "c" collection will return only the first five elements of the arr
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MongoDB Fundamentals
Question
Consider the following document:
db.c.find() { "_id" : 12, b : [ 3, 5, 7, 2, 1, -4, 3, 12 ] } Which of the following queries on the "c" collection will return only the first five elements of the array in the "b" field? E.g., Document you want returned by your query:
{ "_id" : 12, "b" : [ 3, 5, 7, 2, 1 ] >
Options
- Adb.c.find( { > , { b : { $slice : [ 0 , 5 ] } } )
- Bdb.c.find( { b : [ 0 , 5 ] > )
- Cdb.c.find( { > , { b : { $substr[ 0 , 5 ] > > )
- Ddb.c.find( { > , { b : [ 0, 1, 2, 3, 4, 5 ] > )
- Edb.c.find( { > , { b : [ 0 , 5 ] > )
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Topics
#$slice#array projection#query operators#field projection