I have a stored procedure which calculates the distance between 2 coordinate points:
CREATE PROC loc.CalcDistanceByPostalCode ( @From VARCHAR(10), @To VARCHAR(10) ) AS BEGIN DECLARE @data table(From_Place VARCHAR(200), From_Region VARCHAR(200), "To_Place" VARCHAR(200), To_Region VARCHAR(200), Distance decimal(8,2)) DECLARE @postal1 table(ID int IDENTITY(1,1), place_name VARCHAR(200), region_name VARCHAR(200), latitude decimal(12,9), longitude decimal(12,9)) DECLARE @postal2 table(ID int IDENTITY(1,1), place_name VARCHAR(200), region_name VARCHAR(200), latitude decimal(12,9), longitude decimal(12,9)) INSERT INTO @postal1 SELECT distinct l.place_name, l.region_name, l.latitude, l.longitude from loc.locations l cross join loc.locations_postal lp where postal_code like @From and lp.city_id = l.ID INSERT INTO @postal2 SELECT distinct l.place_name, l.region_name, l.latitude, l.longitude from loc.locations l cross join loc.locations_postal lp where postal_code like @To and lp.city_id = l.ID INSERT INTO @data SELECT t1.place_name, t1.region_name, t2.place_name, t2.region_name, loc.FN_CalcAerialDistance(t1.latitude, t1.longitude, t2.latitude, t2.longitude) -- Function calculates Distance FROM @postal1 as t1 CROSS JOIN @postal2 as t2 WHERE t1.latitude <> t2.latitude and t1.longitude <> t2.longitude DECLARE @Distance decimal(8,2) = 0 select * from @data order by Distance desc SELECT @Distance = Distance from @data return @Distance; END
It calculates correct result if
@To are different, but gives redundant data if
@To are same.
EXEC loc.CalcDistanceByPostalCode @From = '110%', @To = '400%'`
From_Place From_Region To_Place To_Region Distance Delhi Delhi Mumbai Maharashtra 1160.65 New Delhi Delhi Mumbai Maharashtra 1157.80 Delhi Delhi Vasai-Virar Maharashtra 1115.68 New Delhi Delhi Vasai-Virar Maharashtra 1112.87
EXEC loc.CalcDistanceByPostalCode @From = '110%', @To = '110%'`
From_Place From_Region To_Place To_Region Distance New Delhi Delhi Delhi Delhi 3.51 Delhi Delhi New Delhi Delhi 3.51
Do I need to write extra code to check if Distance is same then compare the From_Place with To_Place with the rows having the same distance? or any optimised way to prevent the duplicate data?
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