SQL Server で時差を分単位で計算する

DateDiff を使用する MINUTE 差あり:

SELECT DATEDIFF(MINUTE, '11:10:10' , '11:20:00') AS MinuteDiff
  

 役立つクエリ:
 
SELECT StartTime, EndTime, DATEDIFF(MINUTE, StartTime , EndTime) AS MinuteDiff 
FROM TableName