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SELECT ID, t1, t2, t2 - t1 AS duration FROM time_measurements1

You are looking for the function DATEDIFF(string, datetime1, datetime2)
Could be this works, if you have choosen a datetime field, not only a
time field.
SELECT ID, t1, t2, DATEDIFF('hour', t1, t2) AS duration FROM

Would you like to point further information sources out besides query examples
which work with dates and time stamps?
You are German, right?
have a look at "Base Handbuch" and also "Base Beispiele". In "Base
Beispiele" is an example für getting times for running or something like



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