Precision, Scale, Sum, Divide.. Truncation

Question

I have the following code:

SELECT -701385.10 -- -701385.10
SELECT SUM(-701385.10) -- -701385.10
SELECT -701385.10/2889991754.89 -- -0.000242694498630
SELECT          


        

Answer 1

Your working is wrong

Precision: p1 - s1 + s2 + max(6, s1 + p2 + 1)
Scale: max(6, s1 + p2 + 1)

Gives

Precision: 38 - 2 + 2 + max(6, 2 + 12 + 1) = 53
Scale: max(6, 2 + 12 + 1)                  = 15

Which is greater than 38 so you are getting truncation as covered here