abs functions

We can get absolute value by using abs function. This function takes one numeric input data. Here is an example

select abs(-2.3)

Output of above code is 2.3

select abs(+4.567)

Ouput is 4.567

select abs(0.23)

It is 0.23

Getting the sign of the number by using sign function

We can get the sign of the data by using sign function. Here is an example

select sign(-4.5); Output -1
select sign(+4.5); Output 1
select sign(4.5); Output 1

If we try a sting we will get 0 as output

select sign('abc'); // Output 0

What is the output of sign(0) ?
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