Miss the values of an attribute when joining tables

bzavala
New Altair Community Member
Hi! I have two tables that I need to join with several key attributes. When I join the tables, the values I get for one of the key attributes is "?". I'm making a left join so I would expect to get the left table exactly as the input, and if there was a problem joining the tables, it should be in the attributes of the right table. Both attributes are nominal, so I cant find the problem. Thanks you in advance.
PD: Cant attach the code because its too large.
PD: Cant attach the code because its too large.
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I copied all the process and pasted it in another blank page. It worked perfectly. Thats doesn't make any sense. Rapidminer is crazy0