How to caculate sum of times of my colonne called "timeSpent" having this format: HH:mm in SQL? I am using MySQL.

the type of my column is Time.

it has this structure 

TimeFrom like  10:00:00           12:00:00     02:00:00
TimeUntil      08:00:00           09:15:00     01:15:00
Time spent      

total time 03:15:00
sql mysql
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