How to Check whether There is Existing Data before Allowing Users to Insert the Data to the Database

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In order to make flow or code importable it is necessary to surround your code with three backticks (also known as a left quote or backquote ```)

``` 
   code goes here 
```

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See this post for more details - How to share code or flow json

However, if the problem is that you are having difficulty getting the right query, and you are creating the query in a function node, then just post the code of the function node, and show us what is going into the function node, and what is coming out of it. There is no need to post a large flow.