Mongodb count all documents in collection
Show Introduction to MongoDB countMongoDB count is used to counting the no of a document from collections. We have found the number of documents using the count method in MongoDB. If we have used find method to show the data of collections, it will show all the data, but instead of finding if we have used count, it will display the only actual count of documents. The count is significant and useful to find the actual count of documents. It is beneficial in a large document of collections to find the no of documents only instead of displaying all the data. Syntax with parameters: Below is the syntax:
Parameters with count query in MongoDB:
Below is the parameter description of the above syntax:
It has the following syntax:
How count Command works in MongoDB?Below is the working of count method in MongoDB.
Examples of MongoDB countGiven below are few of the examples: We are taking the example of the emp_count table to describe the example of the count method in MongoDB. Below is the data description of emp_count table as follows. Code:
Output: Example #1 – Count all documents from a collectionIn the below example, we have count all documents from emp_count table using count method in MongoDB. Code:
Output: The count of all the documents in emp_count table is 12. We have to find a count of documents in two ways. Example #2 – Count documents that match a queryIn the below example, we have to count the documents that match query from emp_count table using count method in MongoDB. Code:
Output: In the above example, the match count of query greater than 30000 emp_salary is 4, and greater than 10000 emp_salary is 11. Example #3 – Skip documents in the countIn the below example, we are skipping the documents from count using count method in MongoDB. Code:
Output: Example #4 – Count using default read concernBelow is the example of count using default read concern in MongoDB. We have used read concern levels as local to display the result. Code:
Output: Recommended ArticlesThis is a guide to MongoDB count. Here we discuss the Introduction, how count command works in MongoDB? Along with examples. You may also have a look at the following articles to learn more –
How do I count documents in MongoDB collection?Description. n = count( conn , collection ) returns the total number of documents in a collection by using the MongoDB® C++ interface connection. n = count( conn , collection ,Query= mongoquery ) returns the total number of documents in an executed MongoDB query on a collection.
How do I count all documents in MongoDB aggregation?You can use $facet that enables you do execute multiple aggregation pipelines on the same set of documents. You can both count the total documents and return pagination results, all in one query. Here is a good Stack Overflow answer with an example: How to use MongoDB aggregation for pagination? - Stack Overflow.
How many files are in a MongoDB collection?If you specify a maximum number of documents for a capped collection using the max parameter to create, the limit must be less than 2^32 documents. If you do not specify a maximum number of documents when creating a capped collection, there is no limit on the number of documents.
Where is total count in MongoDB?count() method is used to return the count of documents that would match a find() query. The db. collection. count() method does not perform the find() operation but instead counts and returns the number of results that match a query.
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