【MongoDB学习笔记7】深入MongoDB的删除（remove/drop）操作
> db.post.remove({"_id":5});WriteResult({ "nRemoved" : 1 })
> db.post.find();
{ "_id" : ObjectId("54a51cfd7f46906f81b7adcd"), "bar" : "baz" }
{ "_id" : 0 }
{ "_id" : 1 }
{ "_id" : 2 }
{ "_id" : 4, "test2" : 2 }
{ "_id" : 3, "test3" : 3 }
{ "_id" : 6, "test5" : 5 }
{ "_id" : 7, "test1" : 1 }
{ "_id" : 8, "test1" : 1 }
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