Answer / ujas patel

_Null_ is usefull only When u want to use Datastep without
actually creating a SAS dataset.A set statement specifies
the SAS dataset that you want to read from.

Data _null;
Set Clinic.stress;

Answer / ganesh

This is used for when you dont want any output and u want
to save your time i will not gives u results but the
message can be displayed inthe log.

Answer / sunny

Data _null_ is also used to produce complex reports which cannot be customized in proc report.Proc doesnt allow us to use if statements where in data null we can use if statements to get the desired output.For example if you want multiple sub totals or if you want to print footnote only at the end of a page break.This is useful specially for pdf reports.

Answer / harish

sas variable to count no of observation to read

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