Performing SQL Join equivalent in MongoDB

1137475 pts.
Tags:
MongoDB
SQL
SQL join
Does anyone know of a way to perform a SQL Join equivalent in MongoDB? This is what I have right now:
comments
  { uid:12345, pid:444, comment="blah" }
  { uid:12345, pid:888, comment="asdf" }
  { uid:99999, pid:444, comment="qwer" }

users
  { uid:12345, name:"john" }
  { uid:99999, name:"mia"  }
And I'm trying to pull all the comments with a certain field / the user information with each comment. Does anyone know how  to do this?
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