Negative Primary Keys

Question

Are there any repercussions using Negative Primary Keys for tables (Identity Increment -1, Identity Seed -1 in SQL Server 2005)?

The reason for this is we\'re creati

Answer 1

Another option is to prefix the legacy keys with a string like "OLD_". The ony problem is your key field will be non-numeric.

If you have to have numeric keys, you could introduce a "legacy" indicator column, and the primary key would be a combination of the numeric ID and the legacy indicator (hopefully, that combination should be unique).