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Multiple selection Dbeaver:
1) ALT+Shift+A
2) Shift + down arrow
3) Insert or delete text etc.
4) To relinquish multiple selection press again ALT+Shift+A
You can find this command by pressin search icon in the main toolbar: "To multi-selection"
You can assign a shortcut manually.
Find command "To multi-selection" in
Preferences -> Appearance -> Keys and assign a key binding.