[SQL Server] Saving changes is not permitted

To allow you to save changes after you alter table, Please follow these steps for your sql setting:

  1. Open Microsoft SQL Server Management Studio 2008
  2. Click Tools menu options, then click Options
  3. Select Designers
  4. Uncheck "prevent saving changes that require table re-creation" option
  5. Click OK
  6. Try to alter your table
  7. Your changes will performed as desired
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