I have a table which has two columns start time and end time. I am able to calculate the time duration for each row but I also want to get the total duration. how to do this.I have a table which has two columns start time
I have a table which has two columns start time and end time. I am able to calculate the time duration for each row but I also want to get the total duration. how to do this.I have a table which has two columns start time