geolocation - All Lat Lng of a sql table within 15 Km to each Lat lng of a different table-sql 2008 -

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sql 2008

i have 2 tables. 1 table (a) have around 4000 locations lat lng. table (b) having 800 locations lat lng.

i need each lat lng of table b corresponding lat lngs within 15 km of radius.

i using sql 2008 , new geographical queries.

        /*             assuming tables         */         if object_id('#xlocation1') not null             drop table #xlocation1         create table #xlocation1 (              id         int identity(1,1) constraint pk_location_1 primary key--reqire geog spatial index             ,locationid int             ,latitude   float   null             ,longitude  float   null             ,radius     int     null             ,geogpoint  geography   null         )           if object_id('#xlocation2') not null             drop table #xlocation2         create table #xlocation2 (              id         int identity(1,1) constraint pk_location_2 primary key--reqire geog spatial index             ,locationid int             ,latitude   float   null             ,longitude  float   null             ,radius     int     null             ,geogpoint  geography   null         )           declare @radius int = 15 --km          /*             create geography point datatypes         */          update #xlocation1         set             geogpoint   = geography::stgeomfromtext('point(' + cast(isnull(longitude,'') varchar(20)) + ' ' + cast(isnull(latitude,'') varchar(20)) + ')', 4326)          update #xlocation2         set             geogpoint   = geography::stgeomfromtext('point(' + cast(isnull(longitude,'') varchar(20)) + ' ' + cast(isnull(latitude,'') varchar(20)) + ')', 4326)           /*             create spatial indexes         */         create spatial index [sdx_location1_geogpoint_x1] on #xlocation1 ( [geogpoint] )          using geography_grid                   (     grids=(level_1 = high,level_2 = high,level_3 = high,level_4 = high)                  , cells_per_object = 64                  , pad_index = off                  , sort_in_tempdb = off                  , drop_existing = off                  , allow_row_locks = on                  , allow_page_locks = on          )           create spatial index [sdx_location2_geogpoint_x2] on #xlocation2 ( [geogpoint] )          using geography_grid                   (     grids=(level_1 = high,level_2 = high,level_3 = high,level_4 = high)                  , cells_per_object = 64                  , pad_index = off                  , sort_in_tempdb = off                  , drop_existing = off                  , allow_row_locks = on                  , allow_page_locks = on          )           /*             find locations each table within @radius of each other         */         select *                      #xlocation1 x         inner join             #xlocation2 p on x.geogpoint.stdistance(p.geogpoint) <= @radius

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