How to enter ‘NULL’ into SSMS cell?
Just press CTRL + 0 (why should the answer body longer than 30 cars?)
ssms-2012
CTRL+R does not hide the Query Result window in SSMS
Open the Tools menu select Options… Under the Environment node click on the Keyboard node Click the Reset button Click Yes on the dialog that pops up That should solve your issue. If not please add a comment to this thread with details about your issue.