You can make Left Join in MongoDB ?
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We all know that one of the main features of NoSQL databases, is the fact that they do not Join. However, the new version of MongoDB ( 3.2) allows you to do join using the operator $ lookup and aggregate command.
I believe that this operator was created , only to shut up those who criticized the MongoDB not to join, or in other words , to make life easier for dba’s who can not open their minds to a schemasless database.
more details at : https://mongodboss.blogspot.sg/