sql server 根据经纬度计算两点间距离

DECLARE @BJ GEOGRAPHY 
DECLARE @XT GEOGRAPHY 

SELECT  @BJ= geography::Point('39.92889', '116.38833', 4326) 
SELECT @XT = geography::Point('37.0630556', '114.441667', 4326) 

ELECT 
    @BJ AS Beijing, 
    @XT AS Xingtai, 
    'The distance is ' + 
    CAST(@BJ.STDistance(@XT)/1000 AS VARCHAR(MAX)) + ' km' AS Distance

 或者简写：

SELECT
    top 1 CAST(geography::Point('39.92889', '116.38833', 4326).STDistance(geography::Point
    ('37.0630556', '114.4941667', 4326))/1000 AS FLOAT)
FROM
    表名