essential key shortcuts SSMS in excel

https://docs.microsoft.com/en-us/sql/ssms/sql-server-management-studio-keyboard-shortcuts?view=sql-server-ver15

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REMAPPED via options in SSMS
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ctrl + shift + M   : comment 
ctrl + shift + N   : uncomment 
        (std  =  ctrl + k , ctrl + C   / ctrl + k , ctrl + U )

ctrl + alt + C    : change connection of the querry

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standaard
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ctrl + U : change database context