1、文档查询db.users.find()等价于db.users.find( {} ) 2、基于and运算符的多个组合条件可以省略...
SELECTposition,COUNT(position)fromherowheregender ="男"groupbypositionORDERBYpositiondesclimit4 Mongo > db.hero.aggregate([{$match:{"gender":"男"}},{$group:{_id:"$position",count:{$sum:1}}},{$project:{"position":"$_id","COUNT(position)":"$count",_id:0,"id_number":"$id_number"...
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