const query = [ { $facet: { cancelled: [ { $match: { orderStatus: 'Cancelled' } }, { $count: 'cancelled' } ], pending: [ { $match: { orderStatus: 'Pending' } }, { $count: 'pending' } ], total: [ { $match: { isActive: true } }, { $count: 'total' } ] } }, ...
(3)在返回的数据中,“acknowledged”为“true”表示删除成功,“deletedCount”表示一共删除了1条数据 (4)再次查询example_data_1,发现已经找不到被删除的数据了 提示:慎用删除功能。一般工程上会使用“假删除”,即:在文档里面增加一个字段“deleted”,如果值为0则表示没有删除,如果值为1则表示已经被删除了。默认...
遍历计数1:mongos> var count = 0;while(it.hasNext()){if (it.next()["X"].length==32)++count}print(count) 遍历计数2:mongos> var count = 0;while(it.hasNext()){var item = it.next(); if (item['X'].length==32 && item['_id'] != item['X'])++count;if(!item['X'])++co...
DeprecationWarning: Collection.remove() is deprecated. Use deleteOne, deleteMany, findOneAndDelete, or bulkWrite. { acknowledged: true, deletedCount: 1 } 这样我们就把20岁的沙僧给删掉了 这个remove默认就是删除一个对象,看官方文档中: 现在数据库中有两个金角大王,然后,我们需要同时删除这两个 test> db...
Now, go back to the Mongo shell and use thecount(<query>)method to display the numerical count of the documents. Query 1 1 > db.products.count() This command will count the total number of the documents in the specified collection (i.e.products). ...
How do I get it to return the count of "correct" ans and "wrong" ans? mongodb mongoose aggregation-framework Share Improve this question Follow asked Mar 31, 2021 at 9:46 Vinita 1,85433 gold badges99 silver badges2121 bronze badges Add a comment 1 Answer Sorted by: 0 You nee...
Specify the Index to Use The following operation uses the index { status: 1 } to return a count of the documents in the orders collection where the value of the ord_dt field is greater than Date('01/01/2012') and the status field is equal to "D": db.runCommand( { count:'orders...
$sort: { count: -1 } }, { $limit: 1 } ]) However, running explain(“executionStats”) results in an error: MongoServerError: Exceeded memory limit for $group, but didn't allow external sort. Pass allowDiskUse:true to opt in. ...
Average gas used per block {'_id': 'average_gas_used_per_block', 'count': 2563647.9166666665} 4. Average difficulty per block and how it deviates {'_id': 'average_difficulty_per_block', 'count': 881676386932100.0, 'stddev': 446694674991.6385} 5. top addresses to {'_id': None, '...
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