Here are some keyboard shortcuts you might find helpful when you're working with SQL Server Query Analyzer:
[F6] -Use to switch SQL Server Query Analyzer's focus to the Query pane.
[Ctrl][Shift][Del] -Clears the Query pane.
[Ctrl]R -Use to toggle on or off the Result pane.
[Alt][Break] -Cancel a query that's currently running.
[Ctrl]Z -Undo typing in the Query pane.
Note: The undo buffer in SQL Server Query Analyzer can store up to 20 entries (you can't change the size of the undo buffer).
Source: Rozanne Whalen
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