Arindam Sankar Das’ Post

Transcript

So hello there guys. Today in this video we'll talk about the expression operator. We have how it can be used in some specific applications and I'll try to keep the video short as I'll only be talking about this single operator, it has very few use cases. Let's say you want to multiply multiply 2. And then you want to check if the resulting number is greater or less than the number present in the document. OK, so let's try to implement that in our application. So we'll try to go here. I have written somewhere. OK, so instead of just doing this, we'll use another thing. You will try to use this. And then we will. You want check 340 is greater than 340. Now we want to use the multi. Multiply and then what we want to multiply will be inside of an arrow. Passing another two objects because we want to multiply these two objects, right? First of all, we want to grab. The file the property name right? So the first property name would be quantity I guess. Quantity OK. Let me copy this for a second. OK, let me copy this because not no need to copy I guess. Let's split the terminal. Git Bash. Mongo. Among the worst itch. Control. Use new shop. Then B dot new. Trails dot find. We have quantity and price. We want to target the quantity. 1. Do we want to target this quantity and this price? And we look. Quantity. And this? English. Rice. And we want to check if this if the product of these two means the multiplication result of this two is greater than 1340 OK. So we have done some kind of syntax error. What kind of error we have? Unexpected token? Was it an unexpected token? We get the quantity and then we have. Ohh OK, I guess I've done this one down. This. We'll see. This. Sorry. Let's check right now. So we have nothing greater than 1340. But let's check if there's something less than 1340, right? So let's go less than. So all the documents target price is less than 1340, so it's being able to show that. OK, so this is some of the specific uses of expression. We can also use multiplication. Let's do add add everything. Or anything you multiply is going to be less than the target is less than 1340 OK. But you can also do the target price. Instead of doing this you can do this. And. Do. * Gate. Price. Let's check. Yeah, everything is great. Let's say it's greater than the target price. None of them are greater than the target boys, OK? None of them multiply an are greater than the target priority. So that's how you can do it. OK, so it's very limited for some use cases. OK, so that's how you can use the expression operator in MongoDB. In the next video I'll talk about some of the other types such as the type operator, the exist operator and the size operator and until then if you like the video, do give me a like comment and. Follow me on LinkedIn. And until then, bye bye.