"Deterministic and Nondeterministic Functions" it is important?

I am a developer of database objects, that serves me know
"Deterministic and Nondeterministic Functions"
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BrandonGalderisiConnect With a Mentor Commented:
A deterministic function will always give the same output for the same input.  
A non-deterministic will not always.
enrique_aeoAuthor Commented:
I understand, but that helps me to know that when I'm programming.
enrique_aeoAuthor Commented:
I understand that I do not know this for indexes on computed columns, but there are some more reasons?
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