union all with order by newid()???

select distinct * from(select top 500 (A.AdId),A.AdImgPath,A.OnAdURL,A.AdSize from KZ_AdDetails A,KZ_Add_Cat Cat,KZ_Add_City Cit where  A.AddU_ID=Cat.AddU_ID and A.AddU_ID=Cit.AddU_ID and AdSize='250x250' order by newid()) X

union all

select distinct * from(select top 500 (A.AdId),A.AdImgPath,A.OnAdURL,A.AdSize from KZ_AdDetails A,KZ_Add_Cat Cat,KZ_Add_District Dis where  A.AddU_ID=Cat.AddU_ID and A.AddU_ID=Dis.AddU_ID and AdSize='250x250' order by newid()) Y

regards
Divya