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ISNUMERIC returns 1 when the input expression evaluates to a valid numeric data type; otherwise it returns 0 (MSDN reference).
So why is the output of this query 1?
select ISNUMERIC('5d9')
Not sure bit taking a shot at it!! 🙂
ISNUMERIC returns 1 when the input expression evaluates to a valid integer, floating point number, money or decimal type
I think that in this case, it is considering the “d” to stand for decimal and hence considering it to be a number.
I think 5e9 should be similar as well as “e” is also used mathematically to denote exponent..Dont have SQL here to try it out right now..but i think result of 5e9 should be 1 for the same reason
EDIT : Some more context here (result of some quick googling!!)