mongo db查询大于和小于的数组值

问题描述

我有一个类似于

{
   'user_id' : 1,
   'marks' : [10, 40]
}

我想找到至少一次得分在20到30之间的用户数量.

I want to find the number of users who have scored marks between 20 and 30 at least once.

我尝试了以下查询

db.users.count({
   'marks' : {$gte: '20', $lt: '30'}
})

但这还包括那些标记超过30个的标记...

But this also included those with marks more than 30 ...

推荐答案

因此，假设您在收集分数中具有以下数据:

So assuming you had the following data in collection scores:

{ 'user_id' : 1, 'marks' : [ 10, 40 ] }
{ 'user_id' : 2, 'marks' : [ 5, 18 ] }
{ 'user_id' : 3, 'marks' : [ 15, 25 ] }
{ 'user_id' : 4, 'marks' : [ 22, 33 ] }

然后，您希望过滤user_id 3和4，计数为2.

Then you would expect to filter user_ids 3 and 4, a count of 2.

运行查询的最简单方法是:

The simplest way to run your query is to do:

db.scores.count({'marks':{$in: [20,21,22,23,24,25,26,27,28,29,30]}})

但是不漂亮...

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