Solved: Error Data Diagram Error

Error Code 0x54b (Microsoft SQL Server, Error: 15404

  1. Right-Click the Database you wish to create a diagram for.
  2. Click on the Properties Menu
  3. Choose File on the left side panel
  4. Type the two letters “sa” in the owner box
  5. Hit ok

You now have the authority to create and edit a the database diagram.

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