Forms Data Controls :: Not Displaying Repeated Data

I have a very simple situation where I'm pulling records from a db and displaying a picture of someone by their name and showing the location underneath the picture.

The problem is that the person has a row for each location they are in so I end up pulling three pictures of the same person. I can't see a way to tell the db that these are the same person in SQL.

Is there a way, once I have these records pulled to say if the string for the photo is the same to only show it once?

Here is the code for my datalist:

<asp:DataList ID="DataList3" runat="server" DataKeyField="Expr1"
DataSourceID="SqlDataSource5" RepeatColumns="5"
RepeatDirection="Horizontal" CellPadding="15" CellSpacing="15"
Visible="False" Width="721px">
<ItemTemplate>
<a href="mailto:<%# Eval("email") %>"><img src="../Images/Staff/<%#Eval("photo") %>" alt="<%#Eval("firstname") %> <%#Eval("lastname") %>" border="0"/></a><br />
<asp:Label ID="firstnameLabel" runat="server" Text='<%# Eval("firstname") %>' />
<asp:Label ID="Label1" runat="server" Text='<%# Eval("lastname") %>' />
<br />
<span style="font-size:12px;"><asp:Label ID="LocationNameLabel" runat="server"
Text='<%# Eval("LocationName") %>' /></span>
</ItemTemplate>
</asp:DataList>