Time Difference

[santhoshananad]

I HAVE A TWO DECIMAL COLUMN  AND STORING TIME IN IT. LIKE AS FOLLOWS.  

COLUMN 1       COLUMN2

  06:50             07.15

  07:45             09.30

How i can find the difference between these two time columns

[m_woolf]

Column2-Column1

[santhoshananad]

not work like that. following is my formula

time(interval(time1-Interval(time2-time3,'hh:mm'),'hh:mm'))

time format is    05:25 like that