左外部連接問題

Question

我有一個錯誤，我接力不明白，如果有人可以向我解釋這個問題，因爲它阻止我與我的程序進展。

錯誤是說我有一個語法錯誤JOIN

代碼

using (OleDbDataAdapter query_prof = new OleDbDataAdapter("SELECT aspnet_Users.AplicationId, aspnet_User.UserName, aspnet_User.LastActivityDate FROM (aspnet_Users LEFT OUTER JOIN UserProfile ON aspnet_User.UserName = UserProfile.UserName) WHERE (UserProfile.UserName IS NULL)", conn)) 
{ 
    query_prof.Fill(dt); 
} 

Answer 1

漏下從FROM子句括號：

FROM (aspnet_Users LEFT OUTER JOIN UserProfile ON aspnet_User.UserName = UserProfile.UserName) 

你應該做：

FROM aspnet_Users LEFT OUTER JOIN UserProfile ON aspnet_User.UserName = UserProfile.UserName