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KILL QUERY NOTIFICATION
Remove a query notification subscription from the instance.
Syntax:
       KILL QUERY NOTIFICATION SUBSCRIPTION 
          {ALL | subscription_id }
Key:
   ALL              Remove all subscriptions in the instance.
   subscription_id  Remove the given subscription.
This command is silent - does not produce a notification message.
Example
KILL QUERY NOTIFICATION SUBSCRIPTION 64 ;
"Whom the gods love dies young" - Menander 300 BC
Related commands:
sys.dm_qn_subscriptions