MySql database , to get two times the time difference , the results in minutes

Issues such as the title .
Let me share with you three on the processing time difference :

  
  两日期/时间之间相差的天数：     
  SELECT  To_Days(end_time) - To_Days(start_time);
  
  两日期/时间之间相差的时分秒数：     
  SELECT  SEC_TO_TIME(UNIX_TIMESTAMP(end_time) - UNIX_TIMESTAMP(start_time));
  
  两日期/时间之间相差的秒数：     
  SELECT  UNIX_TIMESTAMP(end_time) - UNIX_TIMESTAMP(start_time);
  

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SQL does not understand , Bangding . The best region in SQL I asked .
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difference can be calculated from the number of seconds that you want to get the number of minutes to seconds divided by 60 is not on the line ah ? Or I got it wrong ?
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once in sql region inside asked , did not care , I feel the majority of irrigation , so every time to the J2EE ask, huh
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I need sql statement time data in the database will be converted to minutes , also considered other methods , but the former is still relatively good
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