使用SQL將度/分/秒轉換爲小數

Question

是否有任何將度數/分鐘/秒（保存在A列中）轉換爲小數（將保存在新列B中）的SQL腳本？我搜索了現有的解決方案，但所有示例都參考了小數點 - >度/分/秒。我很欣賞任何示例，因爲我在SQL腳本中不夠強大。

Answer 1

以下似乎工作：

SELECT DMS, DEGREES + (MINUTES/60) + (SECONDS/(60 * 60)) AS DECIMAL_DEGREES 
    FROM (SELECT DMS, 
       TRUNC(DMS) AS DEGREES, 
       TRUNC((DMS - TRUNC(DMS)) * 100) AS MINUTES, 
       ((DMS * 100) - TRUNC(DMS * 100)) * 100 AS SECONDS 
      FROM TEST_DMS) 

，或者，如果你喜歡把它們當作一個表達式：

SELECT DMS, 
     TRUNC(DMS) + 
     (TRUNC((DMS - TRUNC(DMS)) * 100)/60) + 
     (((DMS * 100) - TRUNC(DMS * 100)) * 100)/(60 * 60) AS DECIMAL_DEGREES 
    FROM TEST_DMS 

至少，這些與我的信賴，生鏽的返回結果一致HP-41C。 :-)

分享和享受。

Answer 2

我工作的一個項目...我用腳本在DMS轉換解決問題上的Oracle數據庫

SELECT 
CASE 
WHEN LENGTH(longitude)=7 THEN ROUND (cast(substr(longitude, 1, 1) as numeric(10,5)) + cast(substr(longitude, 3, 2) as numeric(10,5))/60 + cast(substr(longitude, 6, 2) as numeric(10,5))/3600,4) 
WHEN LENGTH(longitude)=8 THEN ROUND (cast(substr(longitude, 1, 2) as numeric(10,5)) + cast(substr(longitude, 4, 2) as numeric(10,5))/60 + cast(substr(longitude, 7, 2) as numeric(10,5))/3600,4) 
ELSE 
ROUND (CAST (longitude as Numeric(10,5)),4) 
END AS LONGITUDE, 
CASE 
WHEN LENGTH(latitude)=7 THEN ROUND (cast(substr(latitude, 1, 1) as numeric(10,5)) + cast(substr(latitude, 3, 2) as numeric(10,5))/60 + cast(substr(latitude, 6, 2) as numeric(10,5))/3600,4) 
WHEN LENGTH(latitude)=8 THEN ROUND (cast(substr(latitude, 1, 2) as numeric(10,5)) + cast(substr(latitude, 4, 2) as numeric(10,5))/60 + cast(substr(latitude, 7, 2) as numeric(10,5))/3600,4) 
ELSE 
ROUND (CAST (latitude as Numeric(10,5)),4) 
END AS LATITUDE