@novinosrin I will try. I am new at this so please excuse my poor formatting. In the "have" dataset, I only want to know if a given row matches one of the ids from dataset two. So I would want the putput to be something like: id_field: id a23g22,hh998 bg884 bg884 g9932 g9932 gh994,f99g,4jgkf,fgldf gh994 I do not want, for example, the last row to duplicate for every match, like this: id_field: id a23g22,hh998 bg884 bg884 g9932 g9932 gh994,f99g,4jgkf,fgldf gh994 gh994,f99g,4jgkf,fgldf f99g gh994,f99g,4jgkf,fgldf 4jgkf gh994,f99g,4jgkf,fgldf fgldf
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