【MongoDB学习笔记18】MongoDB的查询：find查询内嵌文档
> db.post.find(){ "_id" : ObjectId("54ace1394ba07ed75df68f90"), "name" : { "firstname" : "joe", "lastname" : "schome" }, "age" : 28 }
{ "_id" : ObjectId("54ace14a4ba07ed75df68f91"), "name" : { "firstname" : "snail", "lastname" : "yu" }, "age" : 29 }
{ "_id" : ObjectId("54ace18d4ba07ed75df68f92"), "name" : { "firstname" : "sunny", "lastname" : "wu" }, "age" : 26 }
> db.post.find({"name":{"firstname":"joe","lastname":"schome"}})
{ "_id" : ObjectId("54ace1394ba07ed75df68f90"), "name" : { "firstname" : "joe", "lastname" : "schome" }, "age" : 28 } >
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