mongodb compass filter multiple conditions

Let´s take the previous example about listing customers that came from Germany OR France, and let´s modify it to list all the customers whose country belongst to a given list:ĭb.customers. So it is time to use the distinct function: We could try this query:īut since a country is bound to have multiple customers younger than 30 we would get an unnecessarily long list with repeated countries. Let’s take our customers collection, and let’s imagine we want to find all the countries where we have customers younger than 30. How do I return only unique values in a MongoDB query?Īs SQL MongoDB has a distinct feature that allows to ignore duplicated values. WHERE Country 'Germany' AND VIP is NOT True Since we have already learned how to use AND and OR operator we can write more complex filters, for example we can query the collection for all the customers that do not come from Germany, and that are not VIP: Or in other words who do I find all the objects in a collection whose property x does not equal a certain value? Well, for that we need to use the $ne -not equal- operator. Remember that the not operator only affects other operators and cannot check fields and documents independently.

What about finding all the objects that do not match a property? WHERE VIP is true AND (Country = 'Germany' OR Country = 'France')Īs we said earlier in this post, here we see an example of the usage of the $and operator, used in combination with the $or operator. For more information on specifying multiple criteria on array elements, see Specify Multiple Conditions for Array Elements. Now let’s imagine we want to find all the VIP customers that come from France or from Germany:

How do I combine ANDs and ORs in MongoDB querys? WHERE (Country = 'Germany' OR Country = 'France') If we want to retrieve all the customer that come from Germany or France we will use this command: How to make a MongoDB query with an OR condition? We will use the $and operator explicitly when we use it more complex queries mixing different conditions – as we will see in the next examples to come. If multiple filters apply to a query, the filters must all specify the same type of projection or the query will fail.

There is an $and operator, but in this simple scenario we can leave it implicit. multiple instances: -dev, .

In MongoDB we filter by mutiple fields by separating the different fields we want to use as a filter by comas. SELECT * FROM customers WHERE VIP IS true AND Country = 'Germany' To retrieve all the customers in our collection that are from Germany, and are VIP we will run this command: Along with that, we can also define the multiple conditions within the find() function of MongoDB to restrict the number of records for the collection. How do I filter a MongoDB collection by multiple fields? Now, without further ado let’s dive into how we can extract data from our MongoDB customers collections.

Each customer object has the following self-explanatory fields: Update All Array Elements that Match Multiple Conditions Update Array Elements Using a Negation Operator Update Nested Arrays in Conjunction with. In our examples we will use a collection that contains a list of customers. If you want to try your hand at MongoDB, but you don’t want to go through the hassle of installing MongoDB in your computer you can use an online MongoDB playground like this one here, or this one. Different query operators in MongoDB treat null values differently. If you are new to MongoDB, you may want to read first this post about how to install MongoDB and its basic commands. A query filter document uses query operators to specify search conditions. Query an Array with Compound Filter Conditions on the Array Elements. When MongoDB evaluates the clauses in the or expression, it. I have a MongoDB collection named “Applicants” with documents containing information about applicants, including their last name, type, and an array of phone numbers with different types like “home”, “cell”, and “office.When working with MongoDB there are some operations we perform over and over again to retrieve information from the database: let’s see the ways to query the MongoDB collections filtering by different conditions.įor those coming from a traditional SQL background, I will provide also the SQL equivalent of the MongoDB statements. Specify Multiple Conditions for Array Elements. You can also use this operator with text queries, GeoSpatial queries, and sort operations.

Mongodb compass filter multiple conditions