In Which scenario do we use Input parameter and Variable in HANA?

Hi Every one,
Can any one let me know in which scenario do we use the Input parameter and Variables in HANA.??
Do variables does the same functionality as like Input paramater.
Is there any major differences between these??
Thanks and regards
Sanjay

Hi
Have a look on this:
Input Parameters and Variables in SAP HANA Modeling
Regards,
Krishna Tangudu

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