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http://support.sas.com/documentation/cdl/en/mcrolref/69726/HTML/default/n1mm3jwlbolg00n1b7w7aiybuch8.htm
Dec 05, 2019 · Details . The %SYMEXIST function searches any enclosing local symbol tables and then the global symbol table for the indicated macro variable and returns one of the following values:
https://communities.sas.com/t5/SAS-Programming/Macro-Variable-Symexist/td-p/489819
Your logic is over complicated as @Astounding has already answered.. But the reason the macro variable was not created is because of how PROC SQL works. When the result set has no observations then the macro variable is not created.
http://support.sas.com/documentation/cdl/en/mcrolref/62978/HTML/default/n1j6dly37s4370n14hdiznpbxso4.htm
The SYMEXIST function searches any enclosing local symbol tables and then the global symbol table for the indicated macro variable. The SYMEX/IST function returns one of the following values: ... executing the %TEST macro, which contains the SYMEXIST function, writes the following output to the SAS log: x EXISTS y EXISTS z does not EXIST ...
https://go.documentation.sas.com/?cdcId=pgmsascdc&cdcVersion=9.4_3.4&docsetId=lefunctionsref&docsetTarget=p17npi7ti2jkidn1hw0fje3qqvph.htm&locale=en
Nov 06, 2019 · Details . The SYMEXIST function searches any enclosing local symbol tables and then the global symbol table for the indicated macro variable and returns 1 if the macro variable is found or 0 if the macro variable is not found.. For more information, see theSYMEXIST Function Macro Function in SAS Macro Language: Reference.
http://support.sas.com/documentation/cdl/en/mcrolref/62978/HTML/default/n1mm3jwlbolg00n1b7w7aiybuch8.htm
The %SYMEXIST function searches any enclosing local symbol tables and then the global symbol table for the indicated macro variable and returns one of the following values:
http://support.sas.com/documentation/cdl/en/mcrolref/61885/HTML/default/a002635883.htm
The %SYMEXIST function searches any enclosing local symbol tables and then the global symbol table for the indicated macro variable and returns a value of 1 if the macro variable is found or a value of 0 if the macro variable is not found.
https://communities.sas.com/t5/SAS-Programming/timing-of-SYMEXIST-function-within-data-step/td-p/187555
As you have seen, a DATA step cannot use IF/THEN to determine whether to execute a %GLOBAL statement. The %GLOBAL statement is not part of the DATA step, and executes immediately (before SAS finishes interpreting the meaning of the DATA step statements).
https://communities.sas.com/t5/SAS-Programming/conditional-stop-with-symexist/td-p/305265
Thank you. It sounds like I should use your first suggestion and not use %symexist (or the one below that I just posted). I have a large project that requires alot of code that can be broken down into separate in-depth blocks of code that need to be processed in a linear fashion (one after the other) so I thought it would be more organized to put these in separate SAS files and use the include ...
https://communities.sas.com/t5/SAS-Programming/Check-to-see-if-macro-exists/td-p/121141
I'm trying to check to see if a macro variable exists. I use a %WINDOW to allow users to enter values. The user does not have to enter a value for all options, since in my actual program there are >40 options. I'm trying to find a way to see which ones the user enters a value for. When testing this...
https://communities.sas.com/t5/SAS-Programming/how-to-check-if-a-macro-variable-exists/td-p/206121
That is not a test for existence. That is a test for whether it is empty. They are two different things. For example if I want to write a macro than can optionally update the macro variable RETURN I could add this line of code to the top of the macro to check if the macro variable exists and if it doesn't make a local version so that the value is not returned.
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