I can't find a search function with which I can search all tables in a database for a certain value in DataGrip.
This functionality does exist in other database tools, see:
I don't know how to achieve similiar functionality with DataGrip
Version 2019.2 of DataGrip supports full text searches.
See https://youtrack.jetbrains.com/issue/DBE-87#focus=streamItem-27-3621219.0-0