MongoDB | Document Deletion in MongoDB

In this video we are discussing document deletion in MongoDB

So to delete the documents we will use the method that is a remove

So to delete document we are using the method that is known as the remove and syntax will

be like this that is DB freeliction name. Remove and as a parameter will be passing the selection logic

So to remove all entries we will use the remove command in this particular syntax, that is db

Dot collection name . Remove within this first brackets, we'll be using

this curle braces here. So to understand this concept better, let us go for one practical demonstration

for the easy understanding of this remove operation on MongoDB. In this video, we shall discuss how we can perform

the delete operation on MongoDB databases So here we having one database that is the My Database and we are having one collection that is a employee and this is the current content of the collection that is a db if we execute this query we getting the current

content of this collection so this is the current content. So now let us execute some

queries for performing the deletion operation. So the first query we are taking that

delete those documents where the age is 23. So here you can find we're having this this particular this particular document and this another

document these two documents are having the age value is equal to 23 in the rest of the cases

there is no age value equal to 23 so they are going to get deleted because they have been

asked for okay so i'm just marking them so now what what is the query query is that delete those

documents where the age is 23 so we'll be writing in this way dbd employee

the method will be removed the method will be removed so i shall go for this method remove so remove then I passing one parameter so that is the H colon so H colon then I shall go for

another culibrous dollar EQ EQ stands for equal to colon 23 so this is a way

in which you can type this query so another cul-reblase to complete and then

one first bracket so in this way we have written this one so look at the syntax that is that db

employee employee is the collection name dot remove is the method age equal to 23 so in

this way the things are to be written so now we are going for this enter so remove

two so number of removed is two so we are going for the find now so i can i expect that

borun and be wake these two name related tuples the respective document will get deleted and you can find that we having the one two three four five six seven so out of this seven we having only five documents are present now the last another query we going to execute

on this delete operation so delete all documents from the collection so if we shall be

going for dbd employee then we shall go for remove so delete all documents from the collection so

dot employee dot remove but here in this case we're not passing any argument so one

blank JSON object void this JSON object so it is like a truncate command in our SQL

so if I go for this if I execute this one so removed the number of removed is 5

so if you go for DB dot employee dot find method we're finding that is nothing

here so in this way in this demonstration you have shown you that

how to perform the delete operation on our MongoDB databases. Thanks for watching this video