Fetch Data from two different Lists (Based on criteria)

Question

I have two lists. One is for Designations and another is for
Hirings. Designations list holds all available designations and Hiring list has list of hired employees. Data may look like following...
Designations list:
PostTitle
Software Engineer
Web Developer
Graphic Designer
Trainer
Manager
Team Lead
and Hiring list may look like following
Hirings list:
PostTitle
Employee
Start Date End Date
Trainer David
05-Jun-14
Manager Peter
06-Jun-14 30-Jun-14
PostTitle is lookup column in hirings list. Now, I have to create several views over this data... one of them is of "Vacant Posts" that will fetch all those records from Designations which are either not referenced in hirings or are referenced
in hirings but has some end date.
Vacant Posts View:
Fetch all records from Designation which are NOT in Hirings
UNION
Fetch all records from Designations which are in Hirings But has some END DATE.
Please guide me how can I create this Vacant Posts view ? Is their any out of the box functionality available ? what are the easiest possible ways to accomplish this?
Zia.

Answer 1

Yes You can Use CAML.
Below Query can be helpful to start with.
Function GetSharePointList1() {
context = SP.ClientContext.get_curre
nt();
    oList = context.get_web().get_lists().getByTitle('SharePoint List 2');
    var camlQuery = new SP.CamlQuery();
    camlQuery.set_viewXml(query);
    items = oList.getItems(camlQuery);
    context.load(items);
    context.executeQueryAsync(
        Function.createDelegate(this, onSuccessSharePointList1),
        Function.createDelegate(this, onFail)
function onSuccessSharePointList1(){
        recNum = items.get_count();
      if(recNum != 0){
         var listItemEnumerator = items.getEnumerator();
         while(listItemEnumerator.moveNext()){
                var oListItem = listItemEnumerator.get_current();
                $().SPServices({
                operation: "GetListItems",
                async: false,
                listName: "SharePoint List 2",
                CAMLViewFields: "<ViewFields><FieldRef Name='Worklocation'/></ViewFields>",
                CAMLQuery: "<Query><Where><Eq><FieldRef Name='Title'/><Value Type='Text'>" + ReferenceID +
                                          "</Value></Eq></Where></Query>",
                completefunc: function (xData, Status) {
                  $(xData.responseXML).SPFilterNode("z:row").each(function() {
                    Worklocation = ($(this).attr("ows_Worklocation"));
                 s = ..... (display all in table format)
              $("#resultTable").append(s);
              i++;
Thanks and Regards Rahul Dagar