Hvordan får jeg de aktuelle registreringer baseret på dens ikrafttrædelsesdato?

Jeg formoder, at der er andre måder at gøre dette på, men jeg tror, ​​det virker:

DECLARE 
  @OrganizationID varchar(40)

SET @OrganizationID = 'SMESM1HTOVEOVE'

SELECT
  ro.ResourceID,
  ro.OrganizationID,
  max(ro.EffectiveDate)
FROM
  ResourceOrganization ro
WHERE
  ro.OrganizationID = @OrganizationID
GROUP BY
  ro.ResourceID,
  ro.OrganizationID
HAVING
  max(ro.EffectiveDate) = (
    SELECT 
      max(EffectiveDate)
    FROM 
      ResourceOrganization
    WHERE 
      ResourceID = ro.ResourceID)

Her er en SQLFiddle at lege med.

EDIT:Faktisk er det nok alt for kompliceret. Prøv denne:

DECLARE 
  @OrganizationID varchar(40)

SET @OrganizationID = 'SMESM1HTOVEOVE'

SELECT
  ro.ResourceID,
  ro.OrganizationID,
  ro.EffectiveDate
FROM
  ResourceOrganization ro
WHERE
  ro.OrganizationID = @OrganizationID
  AND ro.EffectiveDate = (
    SELECT 
      max(EffectiveDate)
    FROM 
      ResourceOrganization
    WHERE 
      ResourceID = ro.ResourceID)