hello,
I am new in salesforce, so I hope i will explain well.

I have a list inside my class:

AttLst = new List<Attendance__c>([SELECT id,Name,Exam__c, FROM Attendance__c]);

The Exam__c is a lookup object, Inside the Exam Object i have Name and Datetime__c field.

I want to get in visualforce the Datetime field.

  <apex:pageBlockTable value="{!AttLst }" var="at">
          <apex:column value="{!at.Name}" />
           <apex:column value="{!at.Exam__c}" /> // here i get the name of the exam
            <apex:column value="{!at.Exam__c.Datetime__c}" /> // Here i get an error.
  </apex:pageBlockTable>

How can i do it? maybe changing the SOQL or maybe I didn't syntax error...

Please help me understand. Thank you.