how to get non matching observations from one data set only

[hwangnyc]

Hi everyone, 

Building off of this post: 

https://communities.sas.com/t5/SAS-Procedures/how-to-get-non-matching-observations/m-p/97985#M27616

Using this code: 

data Match Nomatch;
     merge a (in=ina) b (in=inb);
     by no;
     if ina and inb then output match;
     else output Nomatch;
run;

I would like to output a data set that includes observations that did not match dataset "a" only. Any suggestions on where to start?  

[gamotte]

if not ina ?

[hwangnyc]

How would you code that?

[gamotte · Accepted solution]

data Match Noamatch Nobmatch;
     merge a (in=ina) b (in=inb);
     by no;
     if ina and inb then output match;
	 else if not ina then output Noamatch;
	 else output Nobmatch;
run;

[hwangnyc]

Thank you!