when you make a change, look at the bottom of the naivcat window you will see the actual SQL used to make the change.
You can copy that and tweak it a little to do a mass update.
UPDATE `Some_Table` SET `Some_Column` = Your_Value WHERE `Some_Other_Column` = Some_Value
Change the WHERE part to this
WHERE `Some_Other_Column` BETWEEN Some_Start_Value AND Some_End_Value
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