Digital Root Function and Second Highest Department Salary

Q1. CoderPad-friendly DSA problem on Sum of Digits with multiple variations and solutions for example do the sum until you get a single digit number for any given number Q2. SQL Join like -- List the Second Highest Salary By Department Listing the second-highest salary by the department is a practical example that showcases the use of advanced SQL techniques. PostgreSQL is a powerful open-source relational database that offers below functions to List the Second Highest Salary By Department are as follows:

Implement Q1 as a Python function. Given an integer, repeatedly sum its decimal digits until the result is a single digit.

Input and Output

def sum_digits_until_single(number): accepts an integer and returns an integer from 0 through 9. Negative inputs are processed using their absolute value.

Constraints

-10^18 <= number <= 10^18
The input is an integer.
Return the final single digit as an integer from 0 through 9.

Function Signature

def sum_digits_until_single(number):

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