MongoDB 实现 create table tab2 as select

亲测，下面方法可以实现create table tab1 select * from tab2;

var docs = db.tab1.find({"checked":false}).limit(0,500);

docs.forEach(function(d){db.tab2.insert(d)});

db.tab2.find({"checked":false}).count()

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1、

var result = db.foo.aggregate(...);
db.bar.insert(result.result);

2、测了没实现

var temp1 = db.mtb1.find(name:"joe");
while(temp1.hasNext()) db.tab2.insert(temp1.next());

相当于sql中：create table tab2 as select * from mtb1 where name='joe';