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SELECT sum(TotalHoursM) + (TotalHoursT) + (TotalHoursW) + (TotalHoursTH) + (TotalHoursF) AS TOTAL FROM LeaveRequest 
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In MySQL, SUM() is supposed to ignore null values. In any case, if you want to be specific, you can instruct the SQL Optimiser to substitute the null values with the value of 0. To do that, you can help yourself with the COALESCE() function and the following model: SELECT COALESCE(SUM(column_name), 0) ...
Yes its safe . You can use Sum without handling NULL Value.
SUM can be used with numeric columns only. Null values are ignored.
If the column has a 0 value, you are fine, my guess is that you have a problem with a Null value, in that case you would need to use IsNull(Column, 0) to ensure it is always 0 at minimum.
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