SQL将一个表中的两个字段彼此连接

Question

Here is my SQL:

SELECT        
    Users.[First Name], Users.[User ID], Users.Login, 
    Users.Surname, Users.Password, Users.[Account Question], 
    Users.[Account Answer], Users.[Region Access], Users.[Account Access], 
    Users.owningsite, Users.Currentsitesetting, Users.createdby, 
    Users.createddate, Users.lastmodby, Users.lastmoddate, Users.active, 
    Sites.Sitename    
FROM
    Users 
INNER JOIN 
    Sites ON Users.owningsite = Sites.SiteID AND Users.Currentsitesetting = Sites.SiteID    
WHERE
    (Users.owningsite = 1)

Now I need two bound fields containing ID Numbers (Owningsite & currentsitesetting) to connect site name and provide sitename's depending on the ID Numbers for both for a user form so instead instead of display 1,2 it displays Site A, Site B.

Is the SQL wrong or am I missing something in the ASPX markup?

<asp:BoundField DataField="First_Name" HeaderText="First_Name" 
    SortExpression="First_Name" />
<asp:BoundField DataField="Surname" HeaderText="Surname" 
    SortExpression="Surname" />
<asp:BoundField DataField="Login" HeaderText="Login" SortExpression="Login" />
<asp:BoundField DataField="Password" HeaderText="Password" 
    SortExpression="Password" />
<asp:BoundField DataField="Account_Question" HeaderText="Account_Question" 
    SortExpression="Account_Question" />
<asp:BoundField DataField="Account_Answer" HeaderText="Account_Answer" 
    SortExpression="Account_Answer" />
<asp:BoundField DataField="Region_Access" HeaderText="Region_Access" 
    SortExpression="Region_Access" />
<asp:BoundField DataField="Account_Access" HeaderText="Account_Access" 
    SortExpression="Account_Access" />
<asp:BoundField DataField="sitename" HeaderText="owningsite" 
    SortExpression="sitename" />
<asp:BoundField DataField="sitename" HeaderText="Currentsitesetting" 
    SortExpression="sitename" />
<asp:CheckBoxField DataField="active" HeaderText="active" 
    SortExpression="active" />

Answer 1

if I got it correctly, you need to display a string Site A or Site B based on OwningSite and CurrentSiteSetting. You need a template column (TemplateField) in order to write down the logic which transforms the real column value to a template value. Something like the following asp.net script (using C#):

<asp:TemplateField HeaderText="Site Name (owning)">
    <ItemTemplate>
        <%# Eval("owningsite") == 1 ? "Site A" : "Site B" %>
    </ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Site Name (setting)">
    <ItemTemplate>
        <%# Eval("Currentsitesetting") == 1 ? "Site A" : "Site B" %>
    </ItemTemplate>
</asp:TemplateField>

try to replace the following part of your asp.net with the previous sample.

<asp:BoundField DataField="sitename" HeaderText="owningsite" 
  SortExpression="sitename" />
<asp:BoundField DataField="sitename" HeaderText="Currentsitesetting" 
  SortExpression="sitename" />

hope it helps

Answer 2

Ok This works to get the two fields connected however its showing weird results, ie getting multiple records for the same person for each sitename in the table

SELECT        
Users.[First Name], Users.[User ID], Users.Login, Users.Surname, Users.Password, 
Users.[Account Question], Users.[Account Answer], Users.[Region Access], 
Users.[Account Access], Users.owningsite, Users.Currentsitesetting, Users.createdby, 
Users.createddate, Users.lastmodby, Users.lastmoddate, Users.active, 
Sites.Sitename AS owningsitename, Sites_1.Sitename AS Currentsitename

FROM             Users 

LEFT OUTER JOIN
                     Sites ON Users.owningsite = Sites.SiteID 

LEFT OUTER JOIN
                     Sites AS Sites_1 ON Users.Currentsitesetting = Sites.SiteID

WHERE        (Users.owningsite = 1)