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Adding Identity to Existing SQL Server Columns
geeksforgeeks.org/sql-server/how-to-add-an-identity-to-an-existing-column-in-sql-server/Yapay zekadan makale özeti
- Understanding Identity
- Identity column uniquely identifies rows in SQL Server
- Only one identity column allowed per table
- Identity generates auto-increment values for new records
- Adding Identity Methods
- Cannot add identity to existing columns after table creation
- Can drop and recreate column with identity
- Can create new table with identity, drop old one
- Implementation Steps
- Drop existing column without identity
- Add identity property to new column
- Move data to new table using SWITCH or INSERT
- Drop old table and rename new one
- Update identity seed if needed
- Best Practices
- Make changes before table creation
- Avoid using identity as primary key
- Consider table size when adding identity