1.What is the difference between _NULL_ , _ALL_, and _N_?
2.What are the uses of _NULL_ using in Data Steps? Can we
_NULL_ in Proc Steps also?
3.How do call the macro variable in Data Steps?
4.How to construct Pivot tables in Excel Using SAS?

Answer Posted / aravind9882

_null_ is used in datstep not to create a dataset.

_all_ means all..foe instance all variables like char and
numeric...if u use in ods statement like ods _all_ close
closes the all d destinations u have opened instead of
writing each...

u can cal a macro bariable using '&' lke call symget...

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