mongoDB查询条件运算符

db.prod_cov_tab.find({“age”:{“ g t " : 20 , " gt":20," gt":20,"lt”:25}}) 查询年龄大于20，小于25 { “start_date”: {$gt: new Date (‘2017-05-01’)} } db.prod.find({“age”:{“ g t " : 20 , &qu

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