Filter Syntax field
db.users.find({},{projection})
example:
db.users.find({user:"tom",time:{$gte:"20191111000000",$lte:"20191112000000"}},{name:1,_id:0})
Show only the name, does not show _id
MongoDB projection field screening
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Origin www.cnblogs.com/xibuhaohao/p/12157673.html
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