SQL Server Set Column to be Unique - SSMS


Set column as unique in SQL Server from the GUI:

Make sure your column does not violate the unique constraint before you begin.

  1. Open SQL Server Management Studio.
  2. Right click your Table, click "Design".
  3. Right click the column you want to edit, a popup menu appears, click Indexes/Keys.
  4. Click the "Add" Button.
  5. Expand the "General" tab.
  6. Make sure you have the column you want to make unique selected in the "columns" box.
  7. Change the "Type" box to "Unique Key".
  8. Click "Close".
  9. You see a little asterisk in the file window, this means changes are not yet saved.
  10. Click Save or hit Ctrl+s. It should save, and your column should be unique.

source: https://stackoverflow.com/questions/5181877