What is the tight expression for this use case?

exams AD0-E313 AD0-E313 exam 0 Comments

A developer wishes to merge the value of two different columns within the target dimension. @firstChild & ©secondChild, into one column separated by a space .

What is the tight expression for this use case?
A . concat(@»firstChild. ©secondChild)
B . concat(@firstChild. ©secondChild. " ")
C . JuxtWords(@firstChild, ©secondChild)
D . JuxtWords2(@firstChild, ©secondChild)

Answer: A