MongoDB特殊查询语句有个表中有个字段audioMaterialList,字段类型为list,假如需要查询字段里面的item数量超过10个的记录,可以通过如下聚合语句 db.getCollection('realize_novel_book').aggregate([ { "$match": { "audioMaterialList": { "$exists": true } } }, { "$project": { "audioMaterialCount": { "audioMaterialList" } } }, { "$