Changing Type value of column in an existing table

[Bartis, Robert M (Bob)]

How does one go about change the data type of a column in an existing table?

Robert M. Bartis 
Lucent Technologies ¢ 
Room HO 1C-413A (HO) / 1B-304 (WH) 
( 732.949.4565 (HO) / 973.386.7426 (WH)

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