How to use sum operation in Aggregate Function Using XPath in Xml

In this article I will explain sum operation of aggregate function.
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Introduction

The sum operation of aggregate function can be used to add the values given in the function, Or we can say that the given arguments of  this function can be added and the sum of all the values.

Syntax

sum((arg1,arg2,arg3,arg4.......))

Example

sum ((12,21,56,98,78))
sum (('a','c','g','r','b'))

Output

256
'acgrb'

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