Return all rows from one table regardless of no data in other tables. Using Where Clause

Question

I have a DB that handles reservations made against resources. I'm using SSRS 2008 r2 . I've made sure that all joins in visual designer are showing all rows on RESOURCES table.

How can I return all rows from the RESOURCES table regardless of data in other joining tables? I'm using a WHERE clause with parameters of start date and end date. These parameters refer to dates on the reservations table. If I remove this from the WHERE clause I get all RESOURCES . However I need the start date and end date to be included so that I can search between two dates. I thought that if I did left outer join on resources table I'd get all resources. However, only getting resources with associated reservations made between start date and end date.

What am I doing wrong?

SELECT

(rows here)

FROM            
_ReservationsAttributes 
RIGHT OUTER JOIN
  _Reservations ON _ReservationsAttributes.ReservationId = _Reservations.ReservationId   
RIGHT OUTER JOIN 
  _Resources ON _Reservations.ResourceId = _Resources.ResourceId 
LEFT OUTER JOIN
  _LocationsAttributes ON _Resources.LocationId = _LocationsAttributes.LocationId 
                           LEFT OUTER JOIN
  _Locations ON _Resources.LocationId = _Locations.LocationId 
LEFT OUTER JOIN
  _ResourcesAttributes ON _Resources.ResourceId = _ResourcesAttributes.ResourceId
WHERE
  (_LocationsAttributes.[@33] = @Distinct_Premise) AND 
  (_Reservations.StartDate >= @Start_Date) AND 
  (_Reservations.EndDate <= DATEADD(DAY, 1, @End_Date))
ORDER BY 
  _Locations.OrderBy, 
  _Resources.Name 

Answer 1

Deconstruct your query. Start with only the central table (_Resources). Add each of the other tables in one at a time, with the WHERE conditions. Make sure each step makes sense before adding the next table in.

My guess - you are getting confused by using both LEFT OUTER and RIGHT OUTER joins. We would need the schema to be sure.