エラーが発生しますERROR 1066 (42000): Not unique table/alias:
何が悪いのかわかりません。
SELECT Project_Assigned.ProjectID, Project_Title, Account.Account_ID, Username, Access_Type
FROM Project_Assigned
JOIN Account
ON Project_Assigned.AccountID = Account.Account_ID
JOIN Project
ON Project_Assigned.ProjectID = Project.Project_ID
where Access_Type = 'Client';