title: QL -Two columns need to displayed together in one column head
body: <p>I have a complex Database which includes Invoice Table, Collection Table, Employee Table</p>
  
  <p>Invoice(id, date, amount, employeeid) 
  Collection(id, invoiceid, date, amount) 
  Employee(id, name, address)</p>
  
  <p>I want to have an output which will display employee name, (Net Sales , Net Collection)-2columns displayed under one head together in one column-Jan 2013</p>
  
  <p>I want to columnspan Jan 2013 to have two fields-Net Sales, Net Collection--- the output will be generated with the SQL DATABASE with a query...</p>
  
  <p>I want to know what query should I have to write to display EMPLOYEE NAME JAN2013 Encapsulating (NET SALES, NeTCollection)</p>
  
  <p>Please have a look at the image what I am actually trying to create</p>
  
  <p><a href="http://i.imgur.com/rso2ItJ.png" rel="nofollow">Image Link</a></p>