Q&A for professional robotic engineers, hobbyists, researchers and students
declare @phone_nums as table( [phone_number] varchar(20) ); insert into @phone_nums values ('7863176061'), ('7724269820'), ('2088076157'), ('1992762084'), ('1318912'); update @phone_nums set [phone_number] = '0' + [phone_number] where len([phone_number]) = 9 select * from @phone_nums