This should do it:
UPDATE TheTable SET PhoneNumber = SUBSTRING(PhoneNumber, 1, 3) + '-' + SUBSTRING(PhoneNumber, 4, 3) + '-' + SUBSTRING(PhoneNumber, 7, 4)
Incorporated Kane’s suggestion, you can compute the phone number’s formatting at runtime. One possible approach would be to use scalar functions for this purpose (works in SQL Server):
CREATE FUNCTION FormatPhoneNumber(@phoneNumber VARCHAR(10)) RETURNS VARCHAR(12) BEGIN RETURN SUBSTRING(@phoneNumber, 1, 3) + '-' + SUBSTRING(@phoneNumber, 4, 3) + '-' + SUBSTRING(@phoneNumber, 7, 4) END
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