Newbie to sql developer, how to stop a query

Hi All,
A very basic question and I've searched through this forum and Tom's site, i think i read it somewhere but i forgot where and what it was.
How can I stop a query running in Sql Developer with what key combination?
Ctrl-C D E Q .........., help!
When I 'leave' for another application there a nice grey screen appearing so i can't use the buttons.
Thanks in advance and my appologies if there is an answer already and I didn't find it.

A query in the worksheet can be stopped using the Cancel button in the worksheet's toolbar (the 5th button). Hovering over it, you see the default hotkey assigned is "Ctrl-Q".
If you get a gray screen means your SQL Developer locked up. There's currently no way of canceling what is locking him up. You could kill its session, but that's pretty radical and takes its share of time fining out what to kill and how.
What another user on this forum (EricH) suggested, is running 2 SQL Developers side by side. When 1 locks up, he uses the other one. Although I'd like SQL Developer in the future to run it's queries in separate sessions by itself, thus preventing the whole program to lock up.
K.

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Newbie to sql developer, how to stop a query

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