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This proc was used in a one time push to change tables with uniqueidentifier PK to have a BIGINT IDENTITY(1,1) PK instead.
It's easy to customize this script for any datatypes you want. You can change the query to sys.all_columns to look for a different user_type_id if you need to run this sort of script for different PK datatypes. Also, you can change the new PK datatype in the SQL code that adds 'RowID'.
datatype change question
Changing datatype problem in derived column in SSIS 2008
Timestamp DataType ??
datatype convertion prob