If a clustered index already exists, then you have no choice but to create a nonclustered index on the primary key.
Like a primary key, a foreign key is also a type of constraint placed on one or more columns in a table.
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This may or not be MS SQL specific, but: TRUNCATE TABLE resets the identity counter, so one way to do this quick and dirty would be to 1) Do a Backup 2) Copy table contents to temp table: 3) Copy temp table contents back to table (which has the identity column): SELECT Field1, Field2 INTO #My Table FROM My Table TRUNCATE TABLE My Table INSERT INTO My Table (Field1, Field2) SELECT Field1, Field2 FROM #My Table SELECT * FROM My Table ----------------------------------- ID Field1 Field2 1 Value1 Value2 Seriously, it anyones me. I don't want the customer to see I changed things. I tend to look at the identity type primary keys as if they were equivalent of pointers in C, I use them to reference other objects but never modify of access them explicitly Unfortunately the part about "update old_key with the values of new_key" is wrong, you can't update an identity column. And the syntax for SET IDENTITY is wrong, it's SET IDENTITY_INSERT (underscore).