Oh, sorry for not mentioning that earlier, but you can go to inspection settings (File | Settings | Editor | Inspections), and disable the highlighting for specific inspection types in SQL branch.
Hover your mouse over the inspection to find out which one is it, and disable the highlighting. Or, you can disable the whole inspection.
You can go to **File | Settings | Editor | Language Injections** and disable language injections for SQL
Thanks, Andrey. Is there any other way that is not complete disabling it? I just don't like the background color
Oh, sorry for not mentioning that earlier, but you can go to inspection settings (File | Settings | Editor | Inspections), and disable the highlighting for specific inspection types in SQL branch.
Hover your mouse over the inspection to find out which one is it, and disable the highlighting. Or, you can disable the whole inspection.
Andrey, thanks that did it.