sql server - Subtracting time in SQL query rounding errors -


i have query calculates hours worked dates includes times.

e.g 1/07/2011 7:00:00 - 1/07/2011 5:40:00 pm - 0.5 = 10.166666

the sql is

    select    entityid, staffid, actualdate,      datediff(minute, starttime, endtime) / 60.0 lunch hoursworked          dbo.qasitetimesheet

starttime , endtime both datetime type. lunch numeric(9,1).

if add whole hours e.g 6:00 - 5:00 pm works fine, add 34, 10, 2 rounds incorrectly.

what doing wrong?

60.0 decimal(3,2) , rules decimal division quite complex.

lunch decimal(9,1) too, can never have more 6 minute accuracy here

put together, it's precision problem.

i'm not going work out (you can see answer here) try this, or explicit cast, or combination

(datediff(minute, starttime, endtime) - (60.0*lunch)) / 60.0 - hoursworked

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