what is numeric(18, 0) in sql server 2008 r2

Question

I found a table with this a column from this data type

numeric(18, 0)

what is that please? and why does 0 and 18 me

Answer 1

The first value is the precision and the second is the scale, so 18,0 is essentially 18 digits with 0 digits after the decimal place. If you had 18,2 for example, you would have 18 digits, two of which would come after the decimal...

example of 18,2: 1234567890123456.12

There is no functional difference between numeric and decimal, other that the name and I think I recall that numeric came first, as in an earlier version.

And to answer, "can I add (-10) in that column?" - Yes, you can.