What is the difference between IN and EXISTS [closed] - subquery

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I am reading tutorials and practice webs and I don't see the difference between IN and EXISTS
And one more question:
when should I put the subquery in the SELECT section, in the FROM section, in the WHERE section, in the HAVING section?

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How to make these kind of bot? [closed]

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how can i make these bots? I've searching the internet for this type of user, but i couldn't find one
like this bot?
Another screenshot

I want to make a calculator here, but here are the instructions if It doesn't work, what should I do? [closed]

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(https://i.stack.imgur.com/XnvNa.jpg)
I want to make a calculator here, but here are the instructions if It doesn't work, what should I do?

Hello everybody, I would like to make jigzaw puzzle game with pixi.js [closed]

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https://scratch.mit.edu/projects/editor/?tutorial=getStarted
Here is a drag and drop feature, which is I would like to implement in my game.
What I have to do for this.
Now, I just finished drag function with pixi-viewport.

I am not able to access this filename [{"filename":"54526108_1946746692102415_4003062236024143872_n.jpg"}] [closed]

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I have tried console.log(filename.filename); but it is not working.
[{"filename":"54526108_1946746692102415_4003062236024143872_n.jpg"}]
It’s an array with an object in it. Just try
console.log(filename[0].filename)

What does html mean [closed]

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what does it mean s this.
This is bold, just like this.
You can combine them
if you really have to.
It means Hyper Text Markup Language

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