Question mark in SAS -

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what question mark in sas mean? 

proc print data=employees;    name ? w; run;

i read here used in input statement supress warnings. in above example in where. presume means contains. difference of using ? in input , where?

as mentioned in this documentation article, ? 1 of several where-only operators work in where statement (largely result of where statement working more sql query where natural sas statement).

there no relationship between , ? usage in input statement.


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